#include <iostream>
#include <fstream>
 
using namespace std;
 
int GCD(int a, int b){
    if (b == 0)
        return a;
    else
        return GCD(b, a%b);
}
 
int main() {
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
 
    int n, i, x, y;
    f >> n;
    for (i = 0; i < n; ++i) {
        f >> x >> y;
        g << GCD(x, y) << "\n";
    }
 
    f.close();
    g.close();
    return 0;
}