Input Format
The first line contains the number of items, .
The next  lines contains the item's name and price, separated by a space.
Constraints
Output Format
Print the item_name and net_price in order of its first occurrence.

### Problem solution in Python 3 programming language.

from collections import OrderedDict
my_order = OrderedDict()
for i in range(int(input())):
name,space,price = input().rpartition(' ')
if name not in my_order:
my_order[name] = int(price)
else:
my_order[name] += int(price)
for item_name, net_price in my_order.items():
print(item_name,net_price)

#### Second solution

# Enter your code here. Read input from STDIN. Print output to STDOUT
from collections import OrderedDict
d = OrderedDict()
for _ in range(int(input())):
item, space, quantity = input().rpartition(' ')
d[item] = d.get(item, 0) + int(quantity)
for item, quantity in d.items():
print(item, quantity)

### Problem solution in Python 2 programming language.

from collections import OrderedDict
my_order = OrderedDict()
for i in range(int(raw_input())):
name,space,price = raw_input().rpartition(' ')
if name not in my_order:
my_order[name] = int(price)
else:
my_order[name] += int(price)
for item_name, net_price in my_order.items():
print item_name,net_price