这个表达式的代码该怎么写？

Question

Answer 1

ctext = "J Bn b Fhqk"
    i = 0
    for element in ctext:
        if element == " ":
            print(element,end="")
        else:
            i += 1
            if i <= 4:
                print(chr(ord(element)-1),end="")
            else:
                print(chr(ord(element)+1),end="")

最后解密的结果为：I Am a Girl