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[Music] hi everyone so for today well be working on the solution for the credits problem set so in this problem sets what we want to do is to be able to key in a credit card number and the system must first identify if its a valid credit card number if its valid it must then identify if its a visa american express or mastercard so were given some information about the characteristics of the cards so for example visa card numbers contain 13 digits and start with four american express which i will refer to it as e-max card numbers will contain 15 digits and starts with 34 or 37 mastercard numbers contain 16 digits and start with 51 52 53 54 or 55. so now lets look at the structure of our code we will first prompt the user to key in and input and identify if the card number is valid if the card number is invalid the system will then throw out the message invalid but if its valid it will go on to identify the type of credit card number it is so first lets prompt the user to key in