How to fix bugs in Morse alphabet code?

[dokipo]

Is that better?

alphabet = {'a':'.-', 
'b':'-...', 
'c':'-.-.', 
'd':'-..', 
'e':'.', 
'f':'..-.', 
'g':'--.', 
'h':'....', 
'i':'..', 
'j':'.---',
'k':'-.-', 
'l':'.-..', 
'm':'--', 
'n':'-.', 
'o':'---', 
'p':'.--.', 
'q':'--.-', 
'r':'.-.', 
's':'...', 
't':'-', 
'u':'..-', 
'v':'...-', 
'w':'.--', 
'x':'-..-', 
'y':'-.--', 
'z':'--..', 
' ':'', 
'/':'-..-.', 
'-':'-....-', 
'.':'.-.-.-', 
',':'--..--', 
'1':'.----', 
'2':'..---', 
'3':'...--', 
'4':'....-', 
'5':'.....', 
'6':'-....', 
'7':'--...', 
'8':'---..', 
'9':'----.', 
'0':'-----'}
morse = {}


def encode(plaintext):
    morse_text = ""
    plaintext = plaintext.lower()
    for char in plaintext:
        morse_text += alphabet[char] + "/"
    morse_text += "//"
    return morse_text

def decode(mroz_text):
    plain_text = ""
    morse_array = mroz_text.split("/")
    for val in morse_array:
        for key, value in alphabet.items():
            if value == val:
                plain_text += key
    return plain_text



print(encode("This is first testing sentence."))
print(decode(encode("This is first testing sentence.")))

print(encode("ka b")) # -.-/.-//-...///

Output:
-/..../../...//../...//..-./../.-./.../-//-/./.../-/../-./--.//..././-./-/./-./-.-././.-.-.-///
this is first testing sentence.   
-.-/.-//-...///

Yes, thank you