diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
index e8c7aec..6c3f801 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/Bob.java
@@ -1,10 +1,35 @@
 package school.lemon.changerequest.java.introduction.pr1;
 
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class Bob {
 
     public static String hey(String phrase) {
-        return "";
+        String phraseCheck=phrase.replaceAll(" ","");
+        if(phraseCheck.equals("")){return "Fine.";}
+        char question ='?';
+        char dot = '.';
+        char exclamation ='!';
+        char last= phrase.charAt(phrase.length()-1);
+        String anger= phrase.toUpperCase();
+        String notAnger= phrase.toLowerCase();
+        boolean notString=anger==notAnger;
+        if (last==question&&(notString||phrase!=anger))
+        {return "Yeap.";}
+
+        if (anger==phrase&&anger!=notAnger){return  "Chill out!";}
+
+        return "Whatever.";
+
+
+
+            }
+
+
+
+
     }
 
-}
+
diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
index da96e86..d2bdada 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/ConsoleCalculator.java
@@ -1,9 +1,46 @@
 package school.lemon.changerequest.java.introduction.pr1;
 
 
+import java.util.Scanner;
+
 public class ConsoleCalculator {
 
     public static void main(String[] args) {
+        System.out.print("Console calculator:\n " +
+                "Enter 'add' to perform addition.\n " +
+                "Enter 'sub' to perform subtraction.\n " +
+                "Enter 'mul' to perform multiplication.\n " +
+                "Enter 'div' to perform division.\n " +
+                "Enter 'exit' to exit.\n " +
+                "Enter 'help' to see help message.\n ");
+        int exit=1;
+
+        while (exit==1){
+            System.out.print("Make your choice.\n");
+            Scanner sc = new Scanner(System.in);
+            String s1 = sc.nextLine();
+            if (s1.equals("exit")) {System.out.println("Bye-bye.");
+                exit=0;
+                break; }
+
+            System.out.print("Enter first number\n");
+            int number1 = sc.nextInt();
+            System.out.print("Enter second number\n");
+            int number2 = sc.nextInt();
+            switch (s1) {
+                case "add":
+                    System.out.println("Result of" + number1 + "+" + number2 + "is" + (number1 + number2));
+                    break;
+                case "sub": System.out.println("Result of" + number1 + "-" + number2 + "is" + (number1 - number2));
+                    break;
+                case "mul": System.out.println("Result of" + number1 + "*" + number2 + "is" + (number1 * number2));
+                    break;
+                case "div": System.out.println("Result of" + number1 + "/" + number2 + "is" + (number1 / number2));
+                    break;
+
+                default: System.out.println("WRONG!");
+                    break;
 
+            }}
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java b/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
index b8a218f..d639bb2 100644
--- a/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
+++ b/src/main/java/school/lemon/changerequest/java/introduction/pr1/HammingDistance.java
@@ -2,6 +2,21 @@
 
 public class HammingDistance {
     public static int compute(String a, String a1) {
-        return -1;
-    }
-}
+        char[] aA = a.toCharArray();
+        char[] a1A1 = a1.toCharArray();
+        int count = 0;
+        if (a.length()!= a1.length()) {
+            return -1;
+        }
+        for  (int i=0;i<a.length();i++) {
+            if (a1A1[i]!=aA[i]) {
+                count = count + 1;
+            }
+
+            if (i == a1.length()-1) {
+
+                return count;}
+        }
+
+    return 0;
+    }}
diff --git a/src/test/groovy/school/lemon/changerequest/java/introduction/pr1/BobSpecification.groovy b/src/test/groovy/school/lemon/changerequest/java/introduction/pr1/BobSpecification.groovy
index b806806..331c5d0 100644
--- a/src/test/groovy/school/lemon/changerequest/java/introduction/pr1/BobSpecification.groovy
+++ b/src/test/groovy/school/lemon/changerequest/java/introduction/pr1/BobSpecification.groovy
@@ -26,7 +26,7 @@ class BobSpecification extends Specification {
         "Ending with ? means a question."                || "Whatever."
         "I HATE YOU"                                     || "Chill out!"
         "Wait! Hang on. Are you going to be OK?"         || "Yeap."
-        "                "                               || "Fine."
+        "              "                               || "Fine."
         ""                                               || "Fine."
     }
 }
\ No newline at end of file