write a function in Python which receives a natural decimal N-digit number (0<N<15) as an input and returns the minimal next N-digit number with the same sum of digits or -1 if there isn't one. Examples: Input: Output: 123 132 0200 1001 09999999999999 18999999999999 90 -1 9999 -1

I am unsure what exactly the question is asking, can someone clarify and shed light/ I don't understand the part about next minimal

N digit number.