#include <cstdio>
using namespace std;
int cmmdc(int a, int b){
    int r;
    while (b){
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main(){
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    int t, i, a, b;
    scanf("%d", &t);
    for (i = 1; i <= t; i ++){
        scanf("%d%d", &a, &b);
        printf("%d\n", cmmdc(a, b));
    }
    return 0;
}