我正在编写一个解码程序，但是遇到了以下错误：
ValueError: chr()参数不在范围内（0x110000）
当我输入需要解码的字符串时发生上述错误。输入的字符串为：
[2ea^W_`^k2eiWSd2fZSf2[2S_2gb2fa2`a2YaaV@
当前的代码如下所示：
# String manipulation
# This program accepts a string and an integer
# then decodes the number of lines by a know decryption key
# Initialize the program and necessary variable
print("This progam can decode an encrypted by a known encryption key")
string=""
decoded_message=""
coded_message=""
# Prompting the used for input using a for loop to accept multiple lines
coded_message=input("What is the line to be decoded?")
# Using a for loop, the messges will be decrypted character
# at at time to its ASCII value then decrypted and converted
# back to text
for string in coded_message:
converted_text=ord(string)
decryption=(chr(converted_text-18))
decoded_message+=decryption
# Output the decoded message
print("Your decrypted message is:",decoded_message)
我确定我错过了一些简单的东西，但任何帮助都将是极好的。