#include<iostream>
#include<string>
using namespace std ;
int main(){
    try{
        int age ;
        string name ;
        cin>>name;
        cin>>age;
        if(name.length() <3){
            throw "Invalid username";
        }
        else if(age<18||age>100){
            throw "Invalid age";
        }
        cout<<"Registration successful";
    }
}