use python only

Blackjack is a card game sometimes called Twenty-One. The object of Blackjack is to have a hand of cards whose score is 21, or as close to this as possible. A player whose hand exceeds a score of 21 is said to have bust and loses. A hand in Blackjack is scored as follows: - Cards 2 to 10 are given their card value as points (i.e. 2 to 10 points). - Face cards (the Jack, Queen and King) are all worth 10 points. - The Ace card is worth 11 points, or 1 point if doing so prevents the player from going bust. For example, if a player's hand has three Aces and a 6, one of the Aces will be worth 11 points, while the other two will be worth 1 point, making the score for the hand 19(11+1+1+6). If all three Aces are worth 11 , then the score for the hand would be 39(11+11+11+6) and the player would be bust. Similarly, if two of the Aces are worth 11 points, then the score of the hand would be 29(11+11+1+6) and the player would also be bust. Write a program which asks the user to enter a hand and then calculates its score. The cards in a hand are represented as characters: - Cards 2 to 10 are represented as "2", "3", .., "10". - Face cards (the Jack, Queen and King) are represented as "J", "Q" and "K". - The Ace card is represented as "A". The user will enter the a hand as a string of characters representing cards, separated by comas. E.g.: "A, K, 7" for Ace, King, 7