Stepping Numbers

Given M and N find all stepping numbers in range M to N

Note 1 : Write a Program in any Language

Note 2 : If you have any doubt ask in comment

The Stepping Number:

A number is called as a stepping number if the adjacent digits have a difference of 1.

e.g 123 is stepping number, but 358 is not a stepping number.

Note :- difference can be either +1 or -1 but both not at the same time like for 121 both difference coming +1 and -1 so its not a stepping number.

Digits in number should be ascending order or descending order like 123 or 321

Example:

M = 10, N = 20 (both positive number)

all stepping numbers are 10, 12

Coding Challenge for U 2 - Stepping Numbers