diff --git a/String_Palindrome.py b/String_Palindrome.py
index 6b8302b6477..ab4103fd863 100644
--- a/String_Palindrome.py
+++ b/String_Palindrome.py
@@ -1,15 +1,15 @@
 # Program to check if a string is palindrome or not
 
-my_str = 'aIbohPhoBiA'
+my_str = input().strip()
 
 # make it suitable for caseless comparison
 my_str = my_str.casefold()
 
 # reverse the string
-rev_str = reversed(my_str)
+rev_str = my_str[::-1]
 
 # check if the string is equal to its reverse
-if list(my_str) == list(rev_str):
+if my_str == rev_str:
    print("The string is a palindrome.")
 else:
    print("The string is not a palindrome.")
diff --git a/gcd.py b/gcd.py
index 0f10da082d7..625bf33a2bd 100644
--- a/gcd.py
+++ b/gcd.py
@@ -5,10 +5,10 @@
 a = int(input("Enter number 1 (a): "))
 b = int(input("Enter number 2 (b): "))
 
-i = 1
-while i <= a and i <= b:
-    if a % i == 0 and b % i == 0:
-        gcd = i
-    i = i + 1
+def calc_GCD(x,y):
+    if y==0:
+        return x
+    return calc_GCD(y,x%y)
+gcd=calc_GCD(a,b)
 
 print("\nGCD of {0} and {1} = {2}".format(a, b, gcd))