#include <fstream>
#include <cstdlib>

using namespace std;

inline int gcd(int x, int y)
{
    int r=y;

    while(r)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
    int T, a, b;
    ifstream in( "euclid2.in" );
    ofstream out( "euclid2.out" );

    for( in>>T; T; --T)
    {
        in>>a>>b;
        out<<gcd(a, b)<<'\n';
    }

    return EXIT_SUCCESS;
}