def encrypt_letter(uppercase_letter: str, keystream_value: int) -> str: """The first parameter represents a single uppercase letter and the second represents a keystream value. Apply the keystream value to the letter to encrypt the letter, and return the result. Return a new string contains a new single upper case letter that encrypt by shifting x (x = keystream value) places to the right. >>> encrypt_letter('V', 3) 'Y' >>> encrypt_letter('A', 1) pass