Difficulty:

We would like to calculate which team wins in a soccer penalty shootout. Teams each have 5 kicks initially, and they will start taking kicks alternatively. A successful penalty kick has 1 point. Teams will continue until it is apparent one of them will eventually win. For example, if the score is

`3-2`

after each team has had 4 kicks, and the first team scores its last kick, the game immediately ends`4-2`

, because the last kick of the other team will not change the winner.If after the 10 initial kicks (5 each) there is no winner, teams will have 1 extra kicks each. After extra kicks, if there is still no winner, they get 1 extra kicks each again. This continues until one of them wins.

The input to your function will be the sequence of penalty kick outcomes. An

`X`

indicates a missed kick, whereas an`O`

shows a successful one. There is only one sequence for both teams, and they apply one at a time to the team that is taking the kick. The game may end even if there are more characters remaining in the sequence. Your function should return an array like`[X, Y]`

, where`X`

is the final score of the first team, and`Y`

is that of the second team.

penalty("OOXOOOOOXO");

[ 3, 4 ]

- Hint #1