Warirors Quest

#!/usr/local/bin/python3.7
# -*- coding: utf-8 -*import

text = input()
while True:
    command = input()
    res = ''
    if command == 'For Azeroth':
        break
    if 'GladiatorStance' in command:
        text = text.upper()
        res = text
    elif 'DefensiveStance' in command:
        text = text.lower()
        res = text
    elif 'Dispel' in command:
        args = command.split()
        if args[0] == 'Dispel':
            idx = int(args[1])
            if 0 <= idx < len(text):
                letter = args[2]
                text = text[:idx] + letter + text[idx+1:]
                res = 'Success!'
            else:
                res = 'Dispel too weak.'
    elif 'Target' in command:
        args = command.split()
        if args[0] == 'Target':
            type_ = args[1]
            if type_ == 'Change':
                old = args[2]
                new = args[3]
                if old in text:
                    text = text.replace(old, new)
                    res = text
            elif type_ == 'Remove':
                to_remove = args[2]
                if to_remove:
                    text = text.replace(to_remove, '')
                    res = text
    if res:
        print(res)
    else:
        print("Command doesn't exist!")