#include <iostream>
#include <fstream>
using namespace std;

int gcd(int a, int b){

    if(b == 0)
        return a;

    return gcd(b, a % b);
}

int main(){
    //ifstream fin("date.in");
    ifstream fin("euclid2.in");
    ofstream fout("euclid2.out");
    int t;
    fin >> t;

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

        fout << gcd(a, b) << "\n";
    }


    return 0;
}