diff --git a/0-fizzbuzz.py b/0-fizzbuzz.py
index 36b3e34..ca4c2a5 100755
--- a/0-fizzbuzz.py
+++ b/0-fizzbuzz.py
@@ -17,10 +17,10 @@ def fizzbuzz(n):
 
     tmp_result = []
     for i in range(1, n + 1):
-        if (i % 3) == 0:
-            tmp_result.append("Fizz")
-        elif (i % 3) == 0 and (i % 5) == 0:
+        if (i % 3) == 0 and (i % 5) == 0:
             tmp_result.append("FizzBuzz")
+        elif (i % 3) == 0:
+            tmp_result.append("Fizz")
         elif (i % 5) == 0:
             tmp_result.append("Buzz")
         else:
diff --git a/1-print_square.js b/1-print_square.js
index 9d30a15..f75b011 100755
--- a/1-print_square.js
+++ b/1-print_square.js
@@ -14,7 +14,7 @@ if (process.argv.length <= 2) {
     process.exit(1)
 }
 
-size = parseInt(process.argv[2], 16)
+size = parseInt(process.argv[2])
 
 for (let i = 0 ; i < size ; i ++) {
     for (let j = 0 ; j < size ; j ++) {
diff --git a/2-sort.rb b/2-sort.rb
index 367e511..21322c0 100644
--- a/2-sort.rb
+++ b/2-sort.rb
@@ -11,7 +11,7 @@
 
     # convert to integer
     i_arg = arg.to_i
-    
+
     # insert result at the right position
     is_inserted = false
     i = 0
diff --git a/3-user.py b/3-user.py
index 29e6f5a..32a269e 100755
--- a/3-user.py
+++ b/3-user.py
@@ -54,7 +54,7 @@ def is_valid_password(self, pwd):
             return False
         if self.__password is None:
             return False
-        return hashlib.md5(pwd.encode()).hexdigest().upper() == self.__password
+        return hashlib.md5(pwd.encode()).hexdigest().lower() == self.__password
 
 
 if __name__ == '__main__':