Simple Banking System Simulation

This problem requires you to simulate a basic banking system that supports operations such as account creation, deposit, withdrawal, balance inquiry, and funds transfer.

You will be given a sequence of commands as input. The commands include:

• CREATE account_number initial_balance: Create an account with an initial balance.
• DEPOSIT account_number amount: Deposit the specified amount into the account.
• WITHDRAW account_number amount: Withdraw the specified amount from the account if sufficient funds exist.
• BALANCE account_number: Output the current balance of the account. If the account does not exist, output ERROR.
• TRANSFER from_account_number to_account_number amount: Transfer funds between two accounts. The transfer is successful only if both accounts exist and the source account has at least the amount to be transferred. Otherwise, output ERROR.
• END: Indicates the termination of input.

A transfer operation is valid if \(\text{balance}_{\text{from}} \geq amount\). If the transfer is valid, the system outputs SUCCESS; otherwise, it outputs ERROR.

inputFormat

The input consists of multiple lines, each containing one command. The commands are:

• CREATE account_number initial_balance
• DEPOSIT account_number amount
• WITHDRAW account_number amount
• BALANCE account_number
• TRANSFER from_account_number to_account_number amount
• END (to terminate input)

Read from standard input (stdin).

outputFormat

For each BALANCE or TRANSFER command, output the result in the order they appear. For BALANCE commands output the account balance, and for TRANSFER commands output either SUCCESS or ERROR. Each output should be printed on a new line on standard output (stdout).

## sample

CREATE 1 1000
CREATE 2 500
DEPOSIT 1 200
WITHDRAW 2 100
BALANCE 1
TRANSFER 1 2 300
BALANCE 2
END

1200
SUCCESS
700

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