Write a Python program to check if a given input number is a Meraki number. A number is called Meraki number if all adjacent digits in it differ by $1.$ All single digits are considered as Meraki number. Some examples of Meraki number are $0,5,10,12,78,567,101,6787,21012.$ Your program must contain a user$/$programmer$-$defined function Meraki$\_$helper$($int $n)$ which returns $1$ if $n$ is Meraki number, otherwise it returns $0.$