#include <cstdio>

using namespace std;

int euclid(int a, int b){
    if(not b)
        return a;
    return euclid(b, a % b);
}

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

    int t,a,b;

    scanf("%d", &t);

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

    return 0;
}