#include <fstream>

using namespace std;

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

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

int main()
{
    int t, a, b;
    fin>>t;
    
    while (t--) {
        fin>>a>>b;
        fout<<cmmdc(a, b)<<'\n';
    }
    
    return 0;
}