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def gcd(m,n):
if type(m)!=int or type(n)!=int or m<0 or n<0:
return None
else:
while n!=0:
h=m%n
m=n
n=h
return m
result = 0
while True:
n = int(input('enter natural number (0 to quit)'))
if (n == 0): break
result = gcd(result, n)
print('gcd = ' + str(result)) |