#include <bits/stdc++.h>

using namespace std;

int gcd(int a, int b)
{
    if(b == 0) return a;
    return gcd(b, a % b);
}

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

    int test;

    scanf("%d", &test);
    for(; test; --test) {
        int a, b;

        scanf("%d%d", &a, &b);
        printf("%d\n", gcd(a, b));
    }
    return 0;
}