from _future_ import print_function
import sys
current_word = None
word_count = 0
for line in sys.stdin:
    word, counts = line.split("\t".1)
    counts = int(counts)
    if word == current_word:
        word_count += cpunts
    else:
        if current_word:
            print(current_word, word_count, sep="\t")
        current_world = word
        word_count = counts

if current_word:
    print(current_word,word_count, sep="\t")