// editor1
#include<iostream>
#include<string>
using namespace std;
int main()
{
    string c;
    cin>>c;
    try
    {
        if(c.length()!=19)
        {
            throw "Invalid";
        }
        for(int i=0;i<19;i++)
        {
            if(i==4||i==9||i==14)
            {
                if(c[i]!="-")
                {
                    throw "Invalid";
                }
            }
            else
            {
                if(!(c[i]>="A"&&c[i]<="Z")||(c[i]>="a"&&c[i]>="z"))
                {
                    throw "Invalid";
                }
            }
        }
        cout<<"Valid";
    }
    catch(...)
    {
        cout<<"Invalid";
    }
    return 0;
}