How to Resolve Typeerror: Can Only Concatenate Str (Not "Int") to Str [Duplicate]

• I decided to make some kind of secret code for testing purposes with Unicode.
• I've done that by adding numbers to Unicode so it would be kind of secret.
• I've been getting this error, but I don't know how to solve it.
  • Is there any solution?

Original Code

message = input("Enter a message you want to be revealed: ")
secret_string = ""
for char in message:
    secret_string += str(chr(char + 7429146))
print("Revealed", secret_string)
q = input("")

Original Error

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-182-49ece294a581> in <module>
      2 secret_string = ""
      3 for char in message:
----> 4     secret_string += str(chr(char + 7429146))
      5 print("Revealed", secret_string)
      6 q = input("")

TypeError: can only concatenate str (not "int") to str