#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a,int b)
{
    if(b == 0)
        return a;
    return cmmdc(b, a % b);
}


int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");

    int n,i,a,b;
    f>>n;

    for(i = 0; i < n; i++)
    {
        f>>a>>b;

        g<<cmmdc(a,b)<<endl;
    }

}