greatest common divisor (GCD) Python

gcd.py

a = int(input('first number '))
b = int(input('second number '))
if a < b:
    x=a
    a=b
    b=x
else:
    x=b

while x != 0:
    x = a % b
    print(x)
    a=b
    b=x
    
print('ggT is: '+str(a))
exit()