Step Number from 10 to N using python

Question

The Program must accept an integer N. The program must print all the stepping number from 10 to N, if there is no such number present the program should print -1 as

Answer 1

Since I can't comment yet. I will explain the idea of Nick's algorithm here.

1. Create 1-digit number list [1,2,3,4,5,6,7,8,9]

2. Create 2-digit number list by combining number k in 1-digit number list with k*10 + (k-1) or k*10 + (k+1), for example 3 will generate 32 or 34

3. Repeat the step 2 until reaches m-digit number. m is calculated before.