#include<iostream>
#include<regex>
using namespace std;
int main(){
    string code;
    cin>>code;
    regex pattern("^[A-zo-9]{4}-[A-zo-9]{4}-[A-zo-9{4}$");
    if(regex_match(code,pattern))
        cout<<"Valid";
    else
        cout<<"Invalid"
    return 0;
}