#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");

int cmmdc(int a, int b){
    int c;
    while(b){
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{
    int n, a, b;
    f>>n;

    for(int i=0; i<n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }

    f.close();
    g.close();
    return 0;
}