#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout ("euclid2.out");
int a, b, n, i;
int cmmdc(int a, int b)
{
    int r=a%b;
    while(r!=0)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    fin >> n;
    for(i=1;i<=n;i++)
    {
        fin >> a >> b;
        fout << cmmdc(a, b) << '\n';
    }
    return 0;
}