#!/usr/bin/python3
# -*-coding:utf-8 -*
  
from operator import itemgetter 
import sys 
  
current_word = None
current_count = 0
word = None

for line in sys.stdin: 
    line = line.strip() 
    word, count = line.split('\t', 1) 
    try: 
        count = int(count) 
    except ValueError: 
        continue
    if current_word == word: 
        current_count += count 
    else: 
        if current_word: 
            print('%s\t%s' % (current_word, current_count))
        current_count = count 
        current_word = word 
if current_word == word: 
    print('%s\t%s' % (current_word, current_count))