$*$Please do not use AI to generate the answer.

$*$Use python to complete the question$($Write in the simplest beginner$-$friendly way.$)$ The ATM card password consists of $6$ digits, derived from $6$ letters. If there are uppercase letters, they must first be converted to lowercase. The difference between adjacent letters represents one digit of the password. The "difference" is calculated by arranging the letters from $\text{'}$a$\text{'}$ to $\text{'}$z$\text{'}$ sequentially and determining the absolute difference between the positions of two letters. If the difference is $10$ or greater, the unit digit of the difference is used as the password digit. The last digit of the password is the difference between the first and last letters.

For example, if the $6$ letters written are "abcXYZ", the final password will be $"111115".$ Note: The input data will only consist of English letters.