Write a Python function for performing sequential search for a number in a supplied list.

Sequential Search : In computer science, linear search or sequential search is a method for finding a particular value in a list that checks each element in sequence until the desired element is found or the list is exhausted. If success returns the position of the element in the list; otherwise returns $-1.$ The list need not be ordered.

Create a list using the list$()$ function$($s$)$ containing numbers between $0$ and $100$ using random module functions. Next ask user for a number between $0$ and $100$ and call the above function to search for the number in the list and print position of the number in the list if found else print error message.