Bank Account

Lab Python Intermediate 20 points

Create BankAccount with deposit(amount), withdraw(amount) (print insufficient funds instead of going negative) and a balance attribute. Process commands like deposit 50 and withdraw 20, then print the final balance.

Input

Line 1: n. Then n commands.

Output

Any error messages, then balance: B.

Example

Input

4
deposit 100
withdraw 30
withdraw 100
deposit 5

Output

insufficient funds
balance: 75

Sample input available Sample output available

Editor

Python

Hints

Methods change the object's state through self.

getattr(obj, "deposit") fetches a method by name.

Solution explanation

Objects bundle data (the balance) with the operations allowed on it.

Show solution

class BankAccount:
    def __init__(self):
        self.balance = 0

    def deposit(self, amount):
        self.balance += amount

    def withdraw(self, amount):
        if amount > self.balance:
            print("insufficient funds")
        else:
            self.balance -= amount


account = BankAccount()
for _ in range(int(input())):
    action, amount = input().split()
    getattr(account, action)(int(amount))
print(f"balance: {account.balance}")

Output

Answer