#include <iostream>
#include <fstream>

using namespace std;
int Cmmdc(int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int a,b,n,i;
    ifstream fin("euclid2.in");
    ofstream fout("euclid2.out");
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>a>>b;
        fout<<Cmmdc(a,b)<<"\n";
    }



    fout.close();

    return 0;
}