#include<iostream>
#include<fstream>
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 n, a, b;
    fin >> n;
    for (int i = 0; i < n; i++) {
        fin >> a >> b;
        fout << cmmdc(a, b) << '\n';
    }

    fin.close();
    fout.close();
}