#function make_list will 
#create a list of integers
#the size of the list is unknown 
#from the beginning and it will be defined
#the the user choice

def make_list():
	num_list=[]
	again='y'

	while (again=='y'):
		num=int(input("enter number "))
		num_list.append(num)
		print("do you want to add another num ?")	
		again=input("enter y or n to continue or stop ")

	return num_list


def main():
	my_list=make_list()
	print(my_list)
	#will ask user to enter the num
	#if the num in the list
	#find the index
	#otherwise - print error
	
	#reverse list

	my_list.reverse()
	print("reverse list is ")
	print(my_list)

	#sorted list

	print("sorted list is ")
	my_list.sort()
	print(my_list)

	#sorted in decreasing order
	my_list.reverse()
        print("decreased list is ")
        print(my_list)
	
	#copy the list (with one memory location)
	copy_list=my_list
	print("copy of the list ")
	print(copy_list)
	my_list[0]=100
	print(my_list)
	print(copy_list)
	
	num_to_look=int(input("enter num "))
	if (num_to_look in my_list):
		item_index=my_list.index(num_to_look)
		print("index is ", item_index)
	else:
		print("item is not in the list")


main()