# """
# This is the interface that allows for creating nested lists.
# You should not implement it, or speculate about its implementation
# """
#class NestedInteger:
#    def isInteger(self) -> bool:
#        """
#        @return True if this NestedInteger holds a single integer, rather than a nested list.
#        """
#
#    def getInteger(self) -> int:
#        """
#        @return the single integer that this NestedInteger holds, if it holds a single integer
#        Return None if this NestedInteger holds a nested list
#        """
#
#    def getList(self) -> [NestedInteger]:
#        """
#        @return the nested list that this NestedInteger holds, if it holds a nested list
#        Return None if this NestedInteger holds a single integer
#        """

class NestedIterator:
    def __init__(self, nestedList: [NestedInteger]):
        self.flatList = []
        self.flatten(nestedList)
        self.pos = -1
        self.totalLen = len(self.flatList)

    def flatten(self, lst):
        for i in lst:
            if i.isInteger():
                num = i.getInteger()
                self.flatList.append(num)
            else:
                self.flatten(i.getList())
        
    def next(self) -> int:
        self.pos += 1
        return self.flatList[self.pos]
    
    
    def hasNext(self) -> bool:
        return (self.pos+1) < self.totalLen

# Your NestedIterator object will be instantiated and called as such:
# i, v = NestedIterator(nestedList), []
# while i.hasNext(): v.append(i.next())
