Hall Monitor

A floor plan is arranged as follows:

• Four rooms, which all lead into the hallway.
• It's impossible to move between rooms without first going into the hallway.

Create a function that validates whether the path between rooms is possible. The hallway will be given as the letter "H".

Examples

possible_path([1, "H", 2, "H", 3, "H", 4]) ➞ True

possible_path(["H", 3, "H"]) ➞ True

possible_path([1, 2, "H", 3]) ➞ False

Notes

• A route may begin or end in a hallway.
• All inputs are either numbers 1-4, or the letter "H".
• No rooms will repeat.