1ва

password_use = input()

line = input()

while not line == "Sign up":
    commands = line.split()
    command = commands[0]

    if command == "Case":
        if commands[1] == "lower":
            password_use = password_use.lower()
            print(password_use)
        elif commands[1] == "upper":
            password_use = password_use.upper()
            print(password_use)
    elif command == "Reverse":
        startIndex = int(commands[1])
        endIndex = int(commands[2])
        if 0 <= startIndex <= endIndex < len(password_use):
            reversed_str = ''.join(reversed(password_use[startIndex:endIndex + 1]))
            print(reversed_str)

    elif command == "Cut":
        substring = commands[1]
        if substring in password_use:
            password_use = password_use.replace(substring, "")
            print(password_use)
        else:
            print(f"The word {password_use} doesn't contain {substring}.")

    elif command == "Replace":
        char = commands[1]
        password_use = password_use.replace(char, "*")
        print(password_use)

    elif command == "Check":
        new_char = commands[1]
        if new_char in password_use:
            print("Valid")
        else:
            print(f"Your username must contain {new_char}.")

    line = input()