#include <bits/stdc++.h>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc(int a, int b){
    if(b == 0)
        return a;

    return cmmdc(b, a%b);
}

int main(){
    int t, a, b;

    fin >> t;

    while(t--){
        fin >> a >> b;

        fout << cmmdc(a, b) << endl;
    }
    

    return 0;
}