---

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

    def deposit(self, val): self.balance += val
    def withdraw(self, val):
        if val <= self.balance: self.balance -= val
    def transfer(self, other, val):
        if val <= self.balance: self.withdraw(val); other.deposit(val)
    def show(self): print(f"{self.owner}: {self.balance}")