Bank Account Simulation

In this problem, you are required to implement a bank account management system. The system starts with an initial balance of $0 and supports three operations:

• deposit X: Deposit the amount X into the account. The amount must be a number, greater than 0 and less than or equal to 10000. If the amount is not a number, print Invalid deposit amount. If the amount is less than or equal to 0 or greater than 10000, print Deposit amount must be between 0 and 10000.
• withdraw X: Withdraw the amount X from the account. The amount must be a number, greater than 0 and not more than the current balance. If the amount is not a number, print Invalid withdraw amount. If the amount is less than or equal to 0, print Withdraw amount must be positive. If there are insufficient funds for the withdrawal, print Insufficient funds.
• balance: Print the current balance.

Each operation is provided as a separate command line from the standard input. Your task is to process all operations sequentially and print outputs immediately when a balance command is encountered or when an error message is triggered by a deposit or withdrawal command.

All numeric comparisons and validation should follow the constraints: deposit amounts must be \(0 < X \le 10000\) and withdrawal amounts must be \(0 < X \le current\ balance\).

inputFormat

The first line of the input contains an integer N, the number of operations. The following N lines each contain an operation in one of the following formats:

• deposit X
• withdraw X
• balance

Here, X represents the amount and may be a string that should represent a valid number.

outputFormat

For each balance command, print the current balance on a separate line. If an error occurs during a deposit or withdraw operation (due to invalid input or violation of constraints), print the corresponding error message immediately.

## sample

6
deposit 1000
balance
withdraw 200
balance
deposit 300
balance

1000
800
1100

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