Given an integer timer, determine the state of the traffic signal based on the following rules:

• Return "Green" if timer is equal to $0$.

• Return "Orange" if timer is equal to $30$.

• Return "Red" if $30 <$ timer $\leq 90$.

• Return "Invalid" if timer does not satisfy any of the above conditions.

Constraints:

• $0 \leq$ timer $\leq 1000$

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.