# https://leetcode.com/problems/delete-characters-to-make-fancy-string

class Solution:
    def makeFancyString(self, s: str) -> str:
        l = 0
        old = None
        result = []
        for ch in s:
            if old == None or old != ch:
                old = ch
                l = 1
                result.append(old)
            elif old == ch and l <= 2:
                result.append(old)
            l += 1
        return ''.join(result)