#include <fstream>

using namespace std;

ifstream in("euclid2.in");
ofstream out("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, a, b, r;

    in>>t;

    for(int i=0; i<t; ++i){
        in>>a>>b;
        out<<cmmdc(a, b)<<'\n';
    }

    return 0;
}