morse code assignment

[raymond2688]

I got step 2 to work properly thank you. I am on step 3 and I THINK I did the changes but am not confident they are what you meant. also I get and error that i am unsure of
Traceback (most recent call last):
File "C:/Users/raymond/Documents/School/Python/week 3/step_3.1.py", line 17, in <module>
for code_1 in letter:
NameError: name 'letter' is not defined

def text_to_morse(letter):
    if letter == "A":
        code = ".-"
    elif letter == "B":
        code = "-..."
    elif letter == "C":
        code = "-.-."
    elif letter == "D":
        code = "-.."
    else:
        print("Unknown Text")    
    return code
for code_1 in letter:
    letter = (input("Please enter upper case letter to convert to morse code: "))
    code_2 = text_to_morse(letter)
print("Your code for {} is {}.".format(letter,code))