#include <iostream>
#include <fstream>

using namespace std;

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

int n;



int cmmdc(int x, int y) {
    int r;
    do {
    r = x % y;
    x = y;
    y = r;
    } while (r > 0);
    return x;
}

int main() {
    int a,b;
    f>>n;
    for (int i = 1; i <= n; ++i) {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }
    return 0;
}