#include <fstream>

using namespace std;
ifstream in ("euclid2.in");
ofstream out ("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 a,b,n,i;
    in>>n;
    for(i=1;i<=n;++i)
    {
        in>>a>>b;
        out<<cmmdc(a,b)<<"\n";
    }
    return 0;
}