#include <iostream>
#include <fstream>
using namespace std;
int gcd(int a, int b)
{
    if (!b) return a;
    return gcd(b, a % b);
}
int main()
{
    int T,a,b;
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>T;
    for(int i =1;i<=T;i++){
        f>>a>>b;
        g<<gcd(a,b)<<"\n";


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

    return 0;
}