#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);

    for (; T; --T)

    {

        scanf("%d %d", &A, &B);

        printf("%d\n", gcd(A, B));

    }



    return 0;

}