data = input()
products = {}

while data != "buy":
    key, price, value = data.split()
    value = int(value)
    if key not in products:
        products[key] = {price: int(value)}
    else:
        products[key] = {price: int(value)}
    data = input()

for key, value in products.items():
    for nested_key, nested_value in value.items():
        # products[key] = nested_key
        # products[key][nested_key] = nested_value
        products[key] = float(nested_key) * int(nested_value)
for key, value in products.items():
    print(f"{key} -> {products[key]:.2f}")