# Time:  O(n)
# Space: O(n)

class Solution(object):
    def isValid(self, code):
        """
        :type code: str
        :rtype: bool
        """
        def validText(s, i):
            j = i
            i = s.find("":
                return False, i
            return True, k+1

        result, i = validTag(code, 0)
        return result and i == len(code)