#include <stdio.h>
int T,A,B;
int gcd(int a, int b)   
{   
    if (!b) return a;   
    return gcd(b, a % b);   
}   
int main(void)
{
	freopen("euclid2.in", "r", stdin);
	freopen("euclid2.out", "w", stdout);

	scanf("%d", &T);
	while (T)
	{
		scanf("%d %d", &A, &B);
		printf("%d\n", gcd(A, B));
	T--;
	}
	return (0);
}