import random

# function to generate random one-digit numbers
def generate_list(n):
    return [random.randint(0, 9) for _ in range(n)]

# function to check if 7 is in the list
def check_seven(lst):
    if 7 in lst:
        return "List contains the number 7"
    else:
        return "List does not contain the number 7"

# function to swap the 4th and 5th elements of the list
def swap_elements(lst):
    lst[3], lst[4] = lst[4], lst[3]
    return lst

# function to add X, Y, or Z to each element of the list
def add_letters(lst):
    letters = ["X", "Y", "Z"]
    return [str(i) + random.choice(letters) for i in lst]

# prompt the user for the number of elements in the list
num_elements = int(input("Enter the number of elements in the list: "))

# generate the list of random one-digit numbers
lst = generate_list(num_elements)
print("Original list:", lst)

# check if 7 is in the list
print(check_seven(lst))

# swap the 4th and 5th elements of the list
swapped_lst = swap_elements(lst)
print("List after swapping 4th and 5th elements:", swapped_lst)

# add X, Y, or Z to each element of the list
new_lst = add_letters(swapped_lst)
print("List after adding letters:", new_lst)