# """
# This is the interface that allows for creating nested lists.
# You should not implement it, or speculate about its implementation
# """
#class NestedInteger:
#    def __init__(self, value=None):
#        """
#        If value is not specified, initializes an empty list.
#        Otherwise initializes a single integer equal to value.
#        """
#
#    def isInteger(self):
#        """
#        @return True if this NestedInteger holds a single integer, rather than a nested list.
#        :rtype bool
#        """
#
#    def add(self, elem):
#        """
#        Set this NestedInteger to hold a nested list and adds a nested integer elem to it.
#        :rtype void
#        """
#
#    def setInteger(self, value):
#        """
#        Set this NestedInteger to hold a single integer equal to value.
#        :rtype void
#        """
#
#    def getInteger(self):
#        """
#        @return the single integer that this NestedInteger holds, if it holds a single integer
#        Return None if this NestedInteger holds a nested list
#        :rtype int
#        """
#
#    def getList(self):
#        """
#        @return the nested list that this NestedInteger holds, if it holds a nested list
#        Return None if this NestedInteger holds a single integer
#        :rtype List[NestedInteger]
#        """

class Solution:
    def deserialize(self, s: str) -> NestedInteger:
        return self.deserializeHelper(s)
    
    def deserializeHelper(self, s: str) -> NestedInteger:
        if s[0] == "[":
            data = self.split(s[1:-1])
            resultList = NestedInteger()
            for element in data:
                resultList.add(self.deserializeHelper(element))
            return resultList
        return NestedInteger(int(s))

    def split(self, s) -> List[str]:
        res = []
        buf = ""
        level = 0
        for ch in s:
            if ch == "," and level == 0:
                res.append(buf)
                buf = ""
            else:
                buf += ch
                if ch == "[":
                    level += 1
                elif ch == "]":
                    level -= 1
        if buf:
            res.append(buf)
        return res
