def solution(word):
answer = 0
word_list = []
words = 'AEIOU'
def dfs(cnt, w):
if cnt == 5:
return
for i in range(len(words)):
word_list.append(w + words[i])
dfs(cnt+1, w + words[i])
dfs(0,"")
return word_list.index(word)+1

word_list에 A, AA, AAA, AAAA, AAAAA을 넣으면서 DFS를 돌린다cnt가 5가 되면 dfs를 종료(종료 조건)