#include <bits/stdc++.h>
using namespace std;
int n,a,b;
int euclid(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);
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        scanf("%d %d", &a, &b);
        printf("%d\n",euclid(a,b));
    }
    return 0;
}