Orders

products = {}

while True:
    product = input().split()
    if 'buy' in product:
        break

    item = product[0]
    price = float(product[1])
    quantity = int(product[2])

    if item not in products:
        products[item] = [price, quantity]
    else:
        if price != products[item][0]:
            products[item][0] = price
        products[item][1] += quantity


[print(f'{x} -> {(y[0] * y[1]):.2f}') for (x, y) in products.items()]