#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int gcd(int a, int b)
{
    if(!b)
        return a;
    return gcd(b, a % b);
}

int n, i, a, b;

int main()
{
    fin >> n;
    for(i = 1 ; i <= n ; i++)
    {
        fin >> a >> b;
        fout << gcd(a, b) << "\n";
    }
}