#include<fstream>
using namespace std;
unsigned int cmmdc(unsigned int a,unsigned int b)
{
    if(!b) return a;
    return cmmdc(b,a%b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    unsigned int n,a,b; f>>n;
    for(unsigned int i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }
    f.close(); g.close();
    return 0;
}