#include <cstdio>

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

int main(void)
{
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    int nV, a, b;
    scanf("%d", &nV);
    for(; nV; nV--)
        scanf("%d %d", &a, &b),
            printf("%d\n", cmmdc(a, b));
    return 0;
}