#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int euclid(int a,int b)
{
    if(a%b==0)
        return b;
    else
        return euclid(b,a%b);
}
int main()
{
    int T;
    fin>>T;
    for(int i=1;i<=T;i++)
    {
        int a,b;
        fin>>a>>b;
        fout<<euclid(a,b)<<endl;
    }

    return 0;
}