diff --git a/src/type/change_zero_last_bits.py b/src/type/change_zero_last_bits.py
index 3fe420f..4f3a3b0 100644
--- a/src/type/change_zero_last_bits.py
+++ b/src/type/change_zero_last_bits.py
@@ -1,6 +1,6 @@
 def change_zero_last_bits(bits, num_of_bits):
-    bits_list = list(str(bits))
-    for i in range(num_of_bits):
-        bits_list[-(i+1)] = '0'
+    bits_list = list(format(bits,b))
+    for i in reserved(range(num_of_bits)):
+        bits_list[len(bits_list)-i] = '0'
 
     return int("".join(bits_list))
diff --git a/src/type/compare_length.py b/src/type/compare_length.py
index 005dfe5..c95fcda 100644
--- a/src/type/compare_length.py
+++ b/src/type/compare_length.py
@@ -1,2 +1,2 @@
 def compare_length(any1, any2):
-    return any1 == any2
+    return len(str(any1))==len(str(any2))