#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n, a, b;

int Euclid(int a, int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    fin>>n;

    for(int i=1; i<=n; i++)
    {
        fin>>a>>b;
        fout<<Euclid(a, b)<<'\n';
    }
    return 0;
}