def convert_number_to_letter(number: int) -> str:
    """
    This function receives a number, and converts it to its respective alphabet letter in ascending order,
    for example:
    1 - A
    2 - B
    3 - C
    4 - D

    :param int number: The number to be converted.
    :rtype: str
    """
    return chr(ord('@') + number + 1)