#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 n, a, b, i;
    fin>>n;
    for (i=1;i<=n;i++)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<"\n";
    }
    return 0;
}