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for i in range(n):
item, price = input().rsplit(' ', 1)
net_price = int(price)
if item in items:
items[item] += net_price
else:
items[item] = net_price
for item, net_price in items.items():
print(item, net_price)
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Collections.OrderedDict()
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from collections import OrderedDict
n = int(input()) items = OrderedDict()
for i in range(n): item, price = input().rsplit(' ', 1) net_price = int(price) if item in items: items[item] += net_price else: items[item] = net_price
for item, net_price in items.items(): print(item, net_price)