Why codechef is showing runtime error for my code?

See more:

Python3.6

if I am using

l,b = int(input().split())

or

l , b = input().split()

what's wrong in this?
typeError is ..................
int() argument must be a string, a bytes-like object or a number, not 'list'

What I have tried:

for _ in range(int(input())):
    l , b = int(input().split())
    def hcf(l,b):
        if b==0:
            return l
        else:
            return hcf(b,l%b)
    print(hcf(l,b))