Transaction History System with Add, Delete, and Balance Calculation

coinbase Implement a transaction history system, which requires the following functionalities: Add transaction records in the format 'Sender -> Receiver, Amount'. Example: 'A -> B, 20'. Delete a transaction and recalculate the balances for all participants. Output the final account balances. Assume the initial account balance for each participant is 0. Test Case: Input: Transactions = ['A -> B, 20', 'B -> C, 10', 'C -> D, 5'] Delete = 'B -> C, 10' Output: {'A': -20, 'B': 10, 'C': -5, 'D': 5} Example Input {'transactions': ['A -> B, 20', 'B -> C, 10', 'C -> D, 5'], 'delete': 'B -> C, 10'}