#include <iostream>
#include <fstream>

using namespace std;
int cmmdc(int a, int b)
{
    if(b==0) return a;
    else return cmmdc(b,a%b);
}
int main()
{
    ifstream cin("euclid2.in");
    ofstream cout("euclid2.out");

    int n,x,y;
    cin>>n;

    for(int i=1;i<=n;i++)
    {
        cin>>x>>y;
        cout<<cmmdc(x,y)<<'\n';
    }
    return 0;
}