#include <iostream>
#include <fstream>

using namespace std;

const string file = "euclid2";

const string infile = file + ".in";
const string outfile = file + ".out";

const int INF = 0x3f3f3f3f;


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

int main()
{
    fstream fout(outfile.c_str(), ios::out);
    fstream fin(infile.c_str(), ios::in);
    int T;
    fin >> T;
    for(int i = 0; i < T; i++)
    {
        int a, b;
        fin >> a >> b;
        fout << cmmdc(a, b) << "\n";
    }
    fin.close();


    fout.close();
}