trying to make a simple program help please :)

[LongHairLuke]

Hi, l l am trying to make a simple guess program. This is my script: 

def main():
    print ("Guess a letter between a and e")
    randomNumber = b
    
    userGuess = input("Your guess: ")

if userGuess == randomNumber:
     print("You got it")
else:
     print ("That's not it")
    
main()


When l run the program l get error: userGuess is not defined, but l defined userGuess at line 5. I don't get it someone plese help :) 

Lukas Alberts