#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;
    } else {
        return cmmdc(b, a % b);
    }
}

int main()
{
    int n;
    fin >> n;

    for (int i = 0; i < n; i++) {
        int a, b;
        fin >> a >> b;

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

    return 0;
}