#include <stdio.h>   
  
int t, a, b;

int cmmdc(int a, int b)
{
    if (!b) return a;
    return cmmdc(b, a % b);
}

int main()
{
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);

    scanf("%d", &t);
    for (; t; --t)
    {
	scanf("%d %d", &a, &b);
	printf("%d\n", cmmdc(a, b));
    }
  
    return 0;   
}