#include <iostream>
#include<fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int T, a, b;

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