# CaesarDecode.py
etxt = input("请输入加密后文本: ")
for p in etxt:
    if "a" <= p <= "z":
        print(chr(ord("a")+(ord(p)-ord("a")-3)%26), end='')
    elif "A" <= p <= "Z":
            print(chr(ord("A")+(ord(p)-ord("A")-3)%26), end='')
    else:
            print(p, end='')