#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a, int b)
{
    if(b==0)
        return a;
    return euclid(b,a%b);
}
int main()
{
    int a,b,t,i,c;
    ifstream in("euclid2.in");
    ofstream out("euclid2.out");
    in>>t;
    for(i=1;i<=t;i++)
    {
        in>>a>>b;
        c=euclid(a,b);
        out<<c<<endl;
    }
    in.close();
    out.close();
    return 0;
}