#include<iostream>
using namespace std;
int main(){
    string name;
    int age;
    if(!(cin>>name>>age)){
        return 0;
    }
    if(name.length()<3){
        cout<<"Invalid username"<<endl;
    }
    else if(age<18 || age>>100){
        cout<<"Invalid age";
    }
    else{
        cout<<"Registration is successful";
    }
    return 0;
    
}