Can you please answer the exact code for C$?$

Many user$-$created passwords are simple and easy to guess. Write a program that takes a simple password and makes it stronger by replacing characters using the key below, and by appending $"!"$ to the end of the input string. You may assume that the string does not contain spaces and will always contain less than $50$ characters.

$-$ i becomes $1$

$-$ a becomes @

$-$ mbecomes M

$-$ B becomes $8$

$-$ s becomes $\backslash$$

Ex: If the input is:

mypassword

the output is:

Myp@$\backslash$$$\backslash$$word!

Can you please answer the exact code for C$?$