#include <iostream>
#include <fstream>
using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

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

int main()
{
    int n, a, b;
    f >> n;
    for(int i = 1; i <= n; ++i) {
        f >> a >> b;
        g << cmmdc(a, b) << '\n';
    }
}