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class Solution:    def countLetters(self, s: str) -> int:        container = []        j = 0        i = 0        while i < len(s):            j = i            while i < len(s)-1 and s[i] == s[i+1]:                i += 1            container.append(s[j:i+1])            i += 1                    def plus(n):            res = 0            while n>=1:                res += n                n -= 1            return res                res = 0        for sustr in container:            res += plus(len(sustr))        return res

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