#include <iostream>
#include <stdio.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 T, a, b;
    scanf("%d",&T);
    for(; T > 0; --T){
        scanf("%d %d",&a,&b);
        printf("%d\n",gcd(a,b));
    }
    return 0;
}