#include<bits/stdc++.h>
using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int euclid(int a,int b){
    while(b){
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main(){
    int t,a,b;
    f>>t;
    for(int i = 1;i <= t; i++){
        f>>a>>b;
        g<<euclid(a,b)<<endl;
    }
    f.close();
    g.close();

    return 0;
}