Following is Password criteria
• Password must be exactly 7 characters long
• The password must contain at least one Numeric and one Special Character.
By assuming that existing users’ data is already stored in a text file “data.txt”. You have to write code for the “Change Password” button to change the existing user password by validating the user name and old password then validate the new password which should follow the given criteria.

Change Password User Name Old Password New Password Confirm Password Change Password