#include <iostream>
#include <fstream>

using namespace std;

long n;

long Euclid(long x, long y)
{
    long aux=0;
    while(y)
    {
         x =x%y;
         long aux = x;
         x = y;
         y = aux;
    }
    return x;
}

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int main()
{
    fin>>n;
    for(int i=0;i<n;i++)
    {
        long a,b;
        fin>>a>>b;
        fout<<Euclid(a,b)<<endl;;
    }
    return 0;
}