#include <fstream>

using namespace std;

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int a,b;
    int n;
    int i;
    f>>n;
    for(i=1;i<=n;i++){
    f >> a;
    f >> b;
while(a != b)
{
    if(a > b)
        a = a - b;
    if(b > a)
        b = b - a;
}

    g << a<<"\n";
    }
f.close();
g.close();
    return 0;
}