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

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

int gcd(int a, int b) {
    while (b != 0) {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main (){
    int t;
    fin >> t;
    for (int i = 1; i <= t; ++i) {
        int a, b;
        fin >> a >> b;
        fout << gcd(a, b);
        cout << '\n';
    }
    return 0;
}