#include <fstream>

using namespace std;

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

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

int main() {
    int t, x, y;
    fin >> t;
    for ( int i = 1; i <= t; i ++ ) {
        fin >> x >> y;
        fout << cmmdc( x, y ) << "\n";
    }
    return 0;
}