1

username = input()
command = input()

while not command == 'Sign up':
    command = command.split()
    if command[0] == 'Case':
        if command[1] == 'lower':
            username = username.lower()
        elif command[1] == 'upper':
            username = username.upper()
        print(username)
    elif command[0] == 'Reverse':
        start_index = int(command[1])
        end_index = int(command[2])
        if start_index <= len(username) and end_index <= len(username):
            print(username[start_index:end_index+1][::-1])
    elif command[0] == 'Cut':
        if command[1] in username:
            username = username.replace(command[1], '')
            print(username)
        else:
            print(f"The word {username} doesn't contain {command[1]}.")
    elif command[0] == 'Replace':
        username = username.replace(command[1], '*')
        print(username)
    elif command[0] == 'Check':
        if command[1] in username:
            print('Valid')
        else:
            print(f"Your username must contain {command[1]}.")

    command = input()