weird

l = input (). split ();

a = int (l [0])
b = int (l [1])

def gcd(a, b):
    if (b == 0):
        return a
    else:
        return gcd(b, a % b)

def f (x):
    if (x == 0):
        return 1
    return x * f (x - 1);


print (gcd (f (a), f (b)) % 998244353)

为何RE