#include <stdio.h>
#include <stdlib.h>

int cmmdc(int a, int b)
{
    while (b) {
        int t = b;
        b = a % b;
        a = t;
    }
    return a;
}

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

    int n;
    scanf("%d", &n);
    while (n--) {
        int a, b;
        scanf("%d%d", &a, &b);
        printf("%d\n", cmmdc(a, b));
    }

    return 0;
}