You're writing code to control your town's traffic lights. You need a function to handle each change from green, to yellow, to red, and then to green again.

Complete the function that takes a string as an argument representing the current state of the light and returns a string representing the state the light should change to.

For example, when the input is green, output should be yellow.

TypeScript

export function updateLight(current: string): string {
  return ({
    green: "yellow",
    yellow: "red",
    red: "green",
  })[current] as string;
};

Python

def update_light(current: str) -> str:
    return {
        "green": "yellow",
        "yellow": "red",
        "red": "green"
    }[current]