swedishEncoder.py

consonants = ['b','c','d','f','g','h','j','k','l','m','n','p','q','r','s','t','v','w','x','y','z']
vowels = ['a','e','i','o','u']
newLetters = '{consonant}o{consonant}' ## string formatting

while True :
    wordPut = input("enter word : ")
    if wordPut == "-1" :
        break
    else :
        myList = [letter if letter in vowels else newLetters.format(consonant = letter) for letter in wordPut]
        print(''.join(myList))