@interact
def _( plain_text = input_box(label = "Please enter your clear message : ", type = str, default = "Hello World"),\
         letter = input_box(label = "Please enter your encryption letter : ", type = str, default = "L")):
    encrypted_message = ""
    skip = ord(letter[0].lower()) - ord('a')
    for i in [0 , 1 ,.. , len( plain_text ) -1]: # loop through the message character by character
        if ord(plain_text [i].lower()) >= ord('a') and (skip + ord(plain_text[i].lower())) <= ord('z'):
            encrypted_message = encrypted_message + chr ( ord(plain_text [ i ]) + skip )
        elif ord(plain_text [i].lower()) >= ord('a') and (skip + ord(plain_text[i].lower())) >= ord('z'):
            encrypted_message = encrypted_message + chr ( ord(plain_text [ i ]) + skip - 26 )
        else: #if ( not(ord('A') <=ord(plain_text[i].upper()) <= ord('Z'))):
            encrypted_message = encrypted_message + plain_text [ i ]
    print"Plain text:", plain_text, "\n Your Encryption output:",encrypted_message
    
#Problem 2 Bonus 



@interact
def _( plain_text = input_box(label = "Please enter your clear message : ", type = str, default = "a"),\
         letter = input_box(label = "Please enter your encryption letter : ", type = str, default = "y")):
    reverse_standard = ""
    encrypted_message = ""
    skip = ord('z') - ord(letter.lower())
    print "Plain Text:", plain_text


    for j in [0 , 1 ,.. , len( plain_text ) -1]: # loop through the message character by character and encrypt it in "Reverse Standard".
        if ord(plain_text[j]) >= ord("a") and ord(plain_text[j]) <= ord("z"):
            reverse_standard = reverse_standard + chr( ord('z') - (ord(plain_text[j]) - ord('a')))
        elif ord(plain_text[j]) >= ord("A") and ord(plain_text[j]) <= ord("Z"):
            reverse_standard = reverse_standard + chr( ord('Z') - (ord(plain_text[j]) - ord('A')))
        else:
            reverse_standard = reverse_standard + plain_text[j]
    print "Reverse Standard:", reverse_standard


    for i in [0 , 1 ,.. , len(reverse_standard) -1]: # loop through the message character by character and skip to the according letter.
        if ord(reverse_standard[i].lower()) <= ord("z") and ord(reverse_standard[i].lower()) >= ord("a"):
            if ord(reverse_standard[i].lower()) <= ord('z') and (ord(reverse_standard[i].lower()) - skip) >= ord('a'):
                encrypted_message = encrypted_message + chr ( ord(reverse_standard [ i ]) - skip )
            else:
                encrypted_message = encrypted_message + chr ( ord(reverse_standard [ i ]) - skip + 26 )
        else:
            encrypted_message = encrypted_message + reverse_standard [ i ]
    print "Your Encryption output:", encrypted_message