from collections import OrderedDict
menu = OrderedDict()
n = int(input())

for _ in range(n):
    user_input  = input()
    line = user_input.rsplit(" ", 1)
    item = line[0]
    price = int(line[1])
    


    if item in menu:
        menu[item] += price
    else:
        menu[item] = price
    
for thing, total_item in menu.items():
    print(thing, total_item)