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