#include <iostream>
#include <fstream>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int n;

int cmmdc(int a, int b)
{
    if(b == 0)
        return a;
    return (b, a%b);
}

int main()
{
    fin >> n;
    for(int i = 0; i < n; i++)
    {
        int a, b;
        fin >> a >> b;
        fout << cmmdc(a, b) << "\n";
    }
    return 0;
}