#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long a, b, t;
int cmmdc(int a, int b)
{
    if(b==0)
        return a;
    else
        return cmmdc(b, a%b);
}
int main()
{
    f>>t;
    for(long i=1; i<=t; i++)
    {
        f>>a>>b;
        g<<cmmdc(a, b)<<"\n";
    }
    return 0;
}