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