#include <cstdio>

using namespace std;

int n;

int cmmdc(int x, int y){
    if (y == 0){
        return x;
    }
    return cmmdc(y, x % y);
}

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

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

    return 0;
}