#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int cmmdc(int a, int b)
{
    int r = a % b;
    while(r!=0)
    {
        a = b;
        b = r;
        r = a%b;
    }
    return b;
}

int main()
{
    int n, a, b;
    f>>n;
    for(int i=1; i<=n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
    return 0;
}