Series of problems have been presented in Cody aiming at collaborative fun. This problem is based on Alfonso's problem #2825 - Pay it Forward. This one encourages more directed collaboration.
You can solve this problem only if you are nominated by some other player. Once you are nominated, you can solve it by returning anything. You can nominate a player to solve this problem by returning his player ID.
This is not a hacking problem. You should hack only when you are not interested in collaboration.
Example - I have nominated Alfonso by returning his player ID 1379371. (Since test suite of this problem uses codes from his problem, it is fair to nominate Alfonso)