Find the Lexicographically Largest String From the Box I

Description

You are given a string word, and an integer numFriends.

Alice is organizing a game for her numFriends friends. There are multiple rounds in the game, where in each round:

- word is split into numFriends non-empty strings, such that no previous round has had the exact same split.

- All the split words are put into a box.

Find the lexicographically largest string from the box after all the rounds are finished.