#include <fstream>
using namespace std;
ifstream cin("euclid2.in");
ofstream cout("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;
    cin >> n;
    for(int i = 1; i <= n; ++i){
        cin >> a >> b;
        cout << cmmdc(a,b) <<'\n';
    }
    return 0;
}