#include <iostream>
#include <fstream>

using namespace std;

int euclid(int a, int b)
{
    while(b)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    ifstream fin("euclid2.in");
    //ofstream fout("euclid2.out");

    int n, nr1, nr2;
    fin>>n;
    for(int i=1; i<=n; i++)
    {
        fin>>nr1>>nr2;
        cout<<euclid(nr1, nr2)<<endl;
    }

    return 0;
}