#include <bits/stdc++.h>

using namespace std;
long long n,i;
string s1,s2;

int main()
{ cin>>n;
    for(i=1;i<=n;i++) {
            cin>>s1>>s2;
        s1[0]+=32;
        s2[0]+=32;

    }

    cout<<s2<<"."<<s1<<"@retratek.com"<<endl;

    return 0;
}