#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b)
{
    while (b != 0)
    {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main()
{

    int t;
    fin >> t;
    while (t--)
    {
        int a, b;
        fin >> a >> b;
        fout << cmmdc(a, b) << '\n';
    }
    return 0;
}