def validate_coordinate(coordinate):
    """
        Return True if coordinate is valid, else return False
    """
    if len(coordinate) != 2:
        return False
    valid_letters = ["a", "b", "c", "d", "e", "f", "g", "h"]
    valid_numbers = ["1", "2", "3", "4", "5", "6", "7", "8"]
    if not coordinate[0] in valid_letters:
        return False
    if not coordinate[1] in valid_numbers:
        return False
    return True