orders

order = {}
total_price = 0

while True:
    data = input().split()
    if "buy" in data:
        break
    product = data[0]
    price = float(data[1])
    quantity = int(data[2])

    if product not in order:
        order[product] = [price, quantity]
    else:
        order[product][1] += quantity
        order[product][0] = price

for k, v in order.items():
    total_price = v[0]*v[1]
    print(f"{k} -> {total_price:.2f}")