from functools import cache

voyelles = ["A", "E", "I", "O", "U", "Y"]

N = int(input())
words = [input()[:3] for _ in range(N)]


@cache
def find_consonant(w_index=0, previous=0):
    if w_index == len(words):
        return 0

    word = words[w_index]

    valid = []

    count = previous
    for i, w in enumerate(word):
        if w not in voyelles:
            count += 1
        else:
            count = 0

        # print(i, word[:i+1], count)
        
        if count != 3:
            val = find_consonant(w_index=w_index+1, previous=count)
            if val == "*":
                continue
            valid.append(val+i+1)
        else:
            break

    if valid == []:
        return "*"
    return min(valid)



print(find_consonant())