#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 a, b;
    int n;
    fin >> n;
    for (; n--;)
    {
        fin >> a >> b;
        fout << cmmdc(a, b)<<'\n';
    }
}