如何按逆序查找两个字母表之间的长度/间隔？

def reverse_alphabet_interval(start_letter, end_letter):
    start_ascii = ord(start_letter)
    end_ascii = ord(end_letter)
    
    if start_ascii < end_ascii:
        interval = end_ascii - start_ascii
    else:
        interval = start_ascii - end_ascii
    
    return interval

# 示例用法
start = 'Z'
end = 'A'
result = reverse_alphabet_interval(start, end)
print("两个字母表之间的长度/间隔为：", result)