#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

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

int T;

int main()
{
    fin>>T;
    for(int i=0;i<T;i++)
    {
        int a, b;
        fin>>a>>b;
        fout<<cmmdc(a ,b)<<"\n";
    }
}