keeps coming up with invalid syntax error for my elif statement
<p><strong>before i was repeating the similar codes along the print menu within each option selection but i changed it from while to if and elif but doesn't work? it keeps coming up with syntax error</strong></p>

<pre><code>option = 0

while option !=4:

    # Prints the menu to the screen
        print("*** Menu *** \n")
        print("1. Encrypt string")
        print("2. Decrypt string")
        print("3. Brute force decryption")
        print("4. Quit \n")

# Prompts the user
option = int(input("What would you like to do [1,2,3,4]? "))

# input error

if option ==1:
#if the user's selection equals 1


            # Prints to the screen the chosen option and prompts the user to input
            print("In command 1 - encrypt string \n")
            string = input("Please enter string to encrypt: ")
            offsetvalue = int(input("Please enter positive offset value: "))
            print("")

# input error
while offsetvalue &gt; 26 or offsetvalue &lt; 1:
    offsetvalue = int(input("Please enter a positive offset value between 1 - 26: "))

    # Assigns the 'Encryption' variable
    # letter which is encrypted

    Encryption = ""

# Loops the input in variable 'code' for each letter
for letter in string:
    # Converts each letter in 'code' to an ASCII value
    # and adds the positive offset value
    encryption_num = ord(letter)
    encryption_num += offsetvalue

# Loops the ASCII value
if encryption_num &gt; 126:
        encryption_num -= 94
        # adds it to the total string
        encryption_num = chr(encryption_num)
        Encryption += encryption_num
        # encrypted string to the screen
        print("\nEncrypted string:")
        print(Encryption)

elif option == 2:

        # prompts the user to input
        print("In command 2 - decrypt string \n")
        string = input("Please enter string to decrypt: ")
        offsetvalue = int(input("Please enter negative offset value: "))
        print("")

# input error

while offsetvalue &lt; -26 or offsetvalue &gt; -1:
    offsetvalue = int(input("Please enter negative offset value between -1 - -26: "))

# Assigns the 'Decryption' variable
# letter which is decrypted
    Decryption = ""

# Loops the input in variable 'string'

for letter in string:
    # adds variable 'string' to an ASCII value
    # adds negative offset value
    decryption_num = ord(letter)
    decryption_num += offsetvalue
    # Loops the ASCII value to beginning if True
    if decryption_num &lt; 32:
            decryption_num += 94
            # Converts the letter back into a string and adds it to the total string
            decryption_num = chr(decryption_num)
            Decryption += decryption_num
            # Prints the entire decrypted string to the screen
            print("\nDecrypted string:")
            print(Decryption)
</code></pre>

<p><strong>This is where it highlights the error with the elif statement not sure why? it comes up with an invalid message in python.</strong></p>

<pre><code>elif option == 3:
     print("in command 3 -brute force \n")
     string = input("please enter string to decrypt: ")
     offsetvalue = -0
     while offsetvalue != -26:
     decryption_num = 0
     Decryption = ""
while Decryption &lt; len(letter):
      c = ord(string[decryption_num]) + offsetvalue
      if c &lt; 0:
      c += 128
      decryption_num = chr(c)
      Decryption += decryption_str
      decryption_num += 1
      offsetvalue -= 1
      print ("\noffset", offsetvalue, "=Decrypted string:", Decryption)

    # Prompts the user for their selection
    option = int(input("What would you like to do [1,2,3,4]? "))

#input error
elif option == 4:
        print ("\nGoodbye")
</code></pre>
