"""GCD calculator."""
def gcd(m,n):
"""Calculate the greatest common divisor of two numbers.
Args:
m (int): the first number
n (int): the second number
Returns:
int: the greatest common divisor of m and n
"""
pass # TODO: replace by your implementation
def cli_gcd():
"""Read numbers from standard input and print out their gcd."""
pass # TODO: replace by your implementation
if __name__ == '__main__':
cli_gcd()