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