Write a program that asks the user to enter an account number as a string. The account number consists of 8 characters and is divided as follows:
 The first 2 characters are digits and represent the branch (00 for Beirut, 01 for Saida, 02 for Tripoli).
 The remaining 6 characters represent the customer’s account number
A valid account number consists of exactly 8 characters. If the account is valid, the program prints the details
(branch and account number). If the account is not valid, the program displays a message to the user.
Sample Run 1:
Enter a string: 100201
Not valid
//It is not valid because the string is not composed of 8 characters
Sample Run 2:
Enter a string: AB100201
Not valid
//It is not valid because the branch is wrong
Sample Run 3:
Enter a string: 00100201
Branch: Beirut
Customer number: 100201
Sample Run 4:
Enter a string: 0210AB01
Branch: Tripoli
Customer number: 10AB01