#include <bits/stdc++.h>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
inline int Cm(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 << Cm(a,b) << "\n";
    }
    return 0;
}