Miror algorithm cubing

import pyperclip

miror = {
    "R": "L'",
    "L": "R'",

    "U": "U'",
    "U'": "U",

    "D": "D'",
    "D'": "D",

    "F": "F'",
    "F'": "F",

    "R'": "L",
    "L'": "R",

    "L2": "R2",
    "R2": "L2"
}

while True:
    algorithm = input("Geben sie den Algorithmus ein, welcher zu spiegel ist: ").split(" ")
    for i in range(len(algorithm)):
        if algorithm[i] in miror:
            algorithm[i] = miror[algorithm[i]]
    print(algorithm)
    save = " ".join(algorithm)
    print("-"*40)
    print(save)
    print("-"*40)
    pyperclip.copy(save)