#include<iostream>
#include<string>
using namespace std;
int main(){
    string s;
    cin>> s;
    if(s.length()!=19){
        cout<<"Invalid";
        return 0;
    }
    for(int i=0;i<19;i++){
        if(i==4||i==9||i==14){
            if(s[i]!='-'){
                cout<<"Invalid";
                return 0;
            }
            else if(!((s[i]>='A'&&s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))){
                cout<<"Invalid";
                return 0;
            }
        }
        cout << "Valid";
        return 0;
    
}