The coach's shouts

Problem

In the middle of a play there is no time for a full name. Ngozi Okafor, the coach, shouts only the start of each player's name: the shortest one that is not also the start of any other name on the list.

You get names, a list of different, non-empty strings, lowercase and with no spaces, with at least one. Return a list of strings in the same order: the shout for each player. If no start works, because her whole name is the beginning of another one, her shout is the full name. With a single player, the shout is her first letter.

With ["ana", "anabel", "berta", "bruna"]: "ana" and "anabel" share "ana", so "anabel" needs one more letter, "anab"; "ana" sits whole at the start of "anabel", so she gets her full name. "berta" and "bruna" share only the "b": they become "be" and "br". You return ["ana", "anab", "be", "br"].

Examples

• The example

  ["ana", "anabel", "berta", "bruna"] → ["ana", "anab", "be", "br"]

• A single player

  ["ngozi"] → ["n"]

• They all start differently

  ["kiara", "lupita", "mae"] → ["k", "l", "m"]

• Names inside other names

  ["al", "alba", "albana"] → ["al", "alba", "alban"]

• The closest one is not next to it

  ["marisol", "martina", "maria", "mar"] → ["maris", "mart", "maria", "mar"]

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def shouts(names):
    pass

function shouts(names) {
}