#include<fstream>

using namespace std;

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

int cmmdc(int a, int b)
{
    int r;

    while (b!=0 )
    {
        r=a%b;
        a=b;
        b=r;
    }

    return a;
}

int main()
{
    int T,a,b,i;

    fin>>T;

    for (i=1;i<=T;i++)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';
    }

    return 0;
}