def generate_name(some_username):
    new_generated_username = []

    while True:
        command = input().split()
        if command[0] == 'Registration':
           # print(''.join(some_username))
            break

        if command[0] == 'Letters':
            if command[1] == 'Lower':
                some_username = some_username.lower()
                print(some_username)
            elif command[1] == 'Upper':
                some_username = some_username.upper()
                print(some_username)

        if command[0] == 'Reverse':
            start_index = int(command[1])
            end_index = int(command[2])
            substring = ''
            if 0 <= start_index <= len(some_username) and 0 <= end_index < len(some_username):
                substring = some_username[start_index:end_index + 1]
                print(substring[::-1])
            else:
                continue

        if command[0] == 'Substring':
            if command[1] in some_username:
                some_username = some_username.replace(command[1], '')
                print(some_username)
            else:
                print(f"The username {some_username} doesn't contain {command[1]}.")

        if command[0] == 'Replace':
            some_username = some_username.replace(command[1], '-')
            print(some_username)

        if command[0] == 'IsValid':
            if command[1] in some_username:
                print('Valid username.')
            else:
                print(f'{command[1]} must be contained in your username.')

username = input()
generate_name(username)