LeetCode824.Goat Latin

class Solution:
    def toGoatLatin(self, S):
        """
        :type S: str
        :rtype: str
        """
        sList = S.split()
        ch = ''
        for item in sList:
            index = sList.index(item)
            if item[0] in "aeiouAEIOU":
                ch = item + "ma"
                sList[index] = ch
            else:
                ch = item[1:] + item[0] + "ma"
                sList[index] = ch
        ch = ''
        lastIndex = -1
        for item in sList:
            index = sList.index(item, lastIndex + 1)
            lastIndex = index
            ch += item + 'a'*(index + 1) + " "
        return ch[:len(ch)-1]