Collections.OrderedDict() HackerRank

 from collections import OrderedDict


n = int(input())
d = OrderedDict()
for i in range(n):
    item,space,number = input().rpartition(' ')
    number = int(number)
    if item in d.keys():
        d[item] +=number
    else:
        d[item] = number
for i in d.keys():
    print(i,d[i])

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