#include <fstream>
#include <algorithm>

using namespace std;
ifstream cin("euclid2.in");
ofstream cout("euclid2.out");
int main()
{
    int n,a,b;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a>>b;
    cout<<__gcd(a,b)<<"\n";
    }
    return 0;
}