Question $1$

Write a function to check whether a user is

valid user or not. If user is valid user then a

welcome message should display with a token

number. Token number will be generated based

on first palindrome number of $N$ digits.

If the user is not valid user then the function

should display "UserId or password is not valid,

pls try again.".

All valid User$-$id and password should be stored

in an array like below :$-$