#include <iostream>
#include <fstream>
using namespace std;

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

int euclid (int a, int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    in>>t;
    for(int i=1;i<=t;i++)
        {in>>a>>b;out<<euclid(a,b)<<"\n";}
    return 0;
}