#!/bin/python3
import sys
current_word, current_count = None, 0
for line in sys.stdin:
    word, count = line.strip().split('\t', 1)
    try:
        count = int(count)
    except ValueError:
        continue
    if current_word == word:
        current_count += count
    else:
        if current_word:
            print("{}\t{}".format(current_word, current_count))
        current_count = count
        current_word = word
if current_word == word:
    print("{}\t{}".format(current_word, current_count))