#include<bits/stdc++.h>
using namespace std;
int main() {
    string u; int a; cin;
    int l=u.size();
    if(1<5||1>10||!any_of(u.begin().u.end(),::islower)||a<18||a>100){
        cout<<(1<5||1>10||(!any_of(u.begin(),u.end(),::islower))?"Invalid user name":"Invalid age")<<endl;
    }else cout<<"Registration successful"<<endl;
}