Python题目：输入一个字母，变成此字母后面的第三个字母，如果此字母是x,y,z或X,Y,Z，则转换成对应的a,b,c或A,B,C,输出变换后的字母。怎么写

请看下面的Python代码实现：

letter = input("请输入一个字母：")

# 判断是否为小写字母x,y,z
if letter == "x":
    new_letter = "a"
elif letter == "y":
    new_letter = "b"
elif letter == "z":
    new_letter = "c"
# 判断是否为大写字母X,Y,Z
elif letter == "X":
    new_letter = "A"
elif letter == "Y":
    new_letter = "B"
elif letter == "Z":
    new_letter = "C"
else:
    # 将字母转成ASCII码值 + 3，再转回字母
    new_letter = chr(ord(letter) + 3)

print("变换后的字母是：" + new_letter)