Output discrepancy when building Translator

[ichabod801]

That's not the code with my correction. This is:

def translate(phrase):
    translation = ""
    for letter in phrase:
        if letter in "Aa":
            translation = translation + "a"
        elif letter in "Bb":
            translation = translation + "б"
        elif letter in "Cc":
            translation = translation + "к"
        elif letter in "Ll":
            translation = translation + "л"
        elif letter in 'Ii' and translation[-2:] == 'ке':
            translation = translation[:-2] + "cи"
        elif letter in 'Ii':
            translation = translation + "и"
        elif letter in "Ee":
            translation = translation + "е"
        elif letter in "cei":
            translation = translation + "си"
        else:
            translation = translation + letter
    return translation


print(translate(input("Enter word: ")))