#include <fstream>
using namespace std;

ifstream fin ("euclid2.in");
ofstream fout("euclid2.out");

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

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