Traffic Light

Green, then yellow, then red, then green again — forever. What color is it at second t? 🚦

You get the lengths of green, yellow, and red (in seconds), and a time t (seconds after a green began, 0-based, possibly many cycles later). Print the color showing at second t.

Example:

Input: green = 10, yellow = 3, red = 7, t = 12 Output: yellow

One full cycle is 20 seconds. Second 12 comes after the first 10 (green) seconds but within the next 3 (yellow) seconds — so the light is yellow.