#include <fstream>
#include <iostream>

using namespace std;

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

int euclid(int a, int b) {
    int c;
    while (b) {
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}

int a,b;
int T;

int main()
{
    fin>>T;

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

    return 0;
}