#include <iostream>
#include <fstream>

using namespace std;

int t,a,b;

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

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

    scanf("%d", &t);
    for(int i=1; i<=t; i++)
    {
        scanf("%d %d", &a, &b);
        printf("%d\n", gcd(a,b));
    }
}