#include <stdio.h>

int nr, a, b;

int euclid(int a, int b)
{
	while (b != 0)
	{
		int t = b;
		b = a%b;
		a = t;
	}
	return a;
}

int main(void)
{

	freopen("euclid2.in", "r", stdin);
	freopen("euclid2.out", "w", stdout);
	scanf("%d", &nr);
	for (int i = nr; i>0; --i)
	{
		scanf("%d %d", &a, &b);
		printf("%d\n", euclid(a, b));
	}
	return 0;
}