#include <iostream>
#include <fstream>
using namespace std;

int euclid(int a, int b)
{
    if (!b) return a;
    return euclid(b, a % b);
}


int main()
{
int x,n,a,b,i;

ifstream f ("euclid2.in");
ofstream g ("euclid2.out");
f >> n;
while(n){
f>>a>>b;
    g<<euclid(a,b)<<endl;
    n--;
}
return 0;

}