#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; fin >> n;

    for(int i = 1; i <= n; ++i)
    {
        int a, b; fin >> a >> b;

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

    return 0;
}