#include<iostream>
using namespace std;
int main()
{
    string n;
    try
    {
        if(!cin>>n)
        {
            throw "Invalid";
        }
        if(n[4]!='-' || n[9]!='-' || n[14]!='-')
        {
            throw "Invalid";
        }
        cout<<"Valid";
    }
    catch(const char* a)
    {
        cout<<a;
    }
    
}