#include <bits/stdc++.h>
using namespace std;
int gcd(int a,int b){
    int r;
    while(b>0){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main(){
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int t;
    scanf("%d",&t);
    while(t--){
        int a,b;
        scanf("%d %d",&a,&b);
        printf("%d\n",gcd(a,b));
    }
    return 0;
}