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class ChargeService:
    def __init__(self):
        self.balance = 0           # running ledger
        self.seen = {}             # idempotency-key → cached response
        self.log = []

    def charge(self, key, amount):
        if key in self.seen:
            self.log.append(f"cached {self.seen[key]}")
            return self.seen[key]
        self.balance += amount
        receipt = f"OK {self.balance}"
        self.seen[key] = receipt
        self.log.append(f"processed {receipt}")
        return receipt

svc = ChargeService()
svc.charge("idem-A", 100)    # first attempt — processes
svc.charge("idem-A", 100)    # retry SAME key — should return cached
svc.charge("idem-A", 100)    # another retry — still cached
svc.charge("idem-B", 50)     # new key — fresh charge

print("\n".join(svc.log))

# What does this print? Type your prediction.

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