input: Write a function to simulate a simple ATM machine using an `Account` class and an `ATM` class. The `Account` class should have methods to deposit and withdrawal money. The `ATM` class should have methods to create an account, deposit money into an account, withdraw money from an account, and print the account balance. The function should initialize an `ATM` instance and perform the operations described.
  
  
  assert atm_operations(["createAccount", "Alice", 1000], ["deposit", "Alice", 500], ["withdrawal", "Alice", 200], ["printBalance", "Alice"]) == None
  assert atm_operations(["createAccount", "Bob", 1500], ["deposit", "Bob", 700], ["withdrawal", "Bob", 300], ["printBalance", "Bob"]) == None
  assert atm_operations(["createAccount", "Charlie", 2000], ["deposit", "Charlie", 800], ["withdrawal", "Charlie", 400], ["printBalance", "Charlie"]) == None
  
output: def atm_operations(operations):
      class Account:
          def __init__(self, name, balance):
              self.name = name
              self.balance = balance
          
          def deposit(self, amount):
              self.balance += amount
          
          def withdrawal(self, amount):
              self.balance -= amount
      
      class ATM:
          def __init__(self):
              self.accounts = {}
          
          def create_account(self, name, initial_balance):
              self.accounts[name] = Account(name, initial_balance)
          
          def deposit(self, name, amount):
              self.accounts[name].deposit(amount)
          
          def withdrawal(self, name, amount):
              self.accounts[name].withdrawal(amount)
          
          def print_balance(self, name):
              print(self.accounts[name].balance)
      
      atm = ATM()
      
      for op in operations:
          if op[0] == "createAccount":
              atm.create_account(op[1], op[2])
          elif op[0] == "deposit":
              atm.deposit(op[1], op[2])
          elif op[0] == "withdrawal":
              atm.withdrawal(op[1], op[2])
          elif op[0] == "printBalance":
              atm.print_balance(op[1])