#include <fstream>

using namespace std;
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
     int n,a,b,c;
int euclid(int a, int b) {
    int c;
    while (b!=0) {
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}

int main()
{


    ///citire date
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>a>>b;

        g<<euclid(a,b)<<endl;
    }
    return 0;
}