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