from collections import OrderedDict

dic = OrderedDict()
n = int(input())

for i in range(n):
    line = input().rsplit(" ", 1)
    item = line[0]
    price = int(line[1])
    
    if item not in dic.keys():
        dic[item] = price
    else:
        dic[item] += price

for k, v in dic.items():
    print(k, v)