Why doesn't $10-14$ run correctly. What did I do wrong?

# Function to start the program and show the menu.

def main$()$:

display$\_$banner$()$

while True:

display$\_$menu$()$

choice $=$ input$("$

Enter your choice: $")$

if choice $==\text{'}1\text{'}$:

display$\_$birds$()$

elif choice $==\text{'}2\text{'}$:

number$\_$of$\_$birds$()$

elif choice $==\text{'}3\text{'}$:

find$\_$bird$\_$index$()$

elif choice $==\text{'}4\text{'}$:

search$\_$list$()$

elif choice $==\text{'}5\text{'}$:

add$\_$to$\_$front$()$

elif choice $==\text{'}6\text{'}$:

add$\_$to$\_$end$()$

elif choice $==\text{'}7\text{'}$:

add$\_$to$\_$second$\_$last$()$

elif choice $==\text{'}8\text{'}$:

remove$\_$entry$()$

elif choice $==\text{'}9\text{'}$:

sort$\_$birds$()$

elif choice $==\text{'}10\text{'}$:

sort$\_$descending$\_$birds$()$

elif choice $==\text{'}11\text{'}$:

first$\_$and$\_$last$\_$birds$()$

elif choice $==\text{'}12\text{'}$:

display$\_$birds$\_$a$\_$to$\_$l$()$

elif choice $==\text{'}13\text{'}$:

display$\_$birds$\_$m$\_$to$\_$z$()$

elif choice $==\text{'}14\text{'}$:

print$("$Exiting the program..."$)$

break

else:

print$("$Invalid choice. Please select a valid option."$)$

# Start the program

main$()$