#!/usr/bin/env python3
"""reducer.py"""
from operator import itemgetter
import sys

current_word = None
current_count = 0

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_word = word
        current_count = count

if current_word:
    print('%s\t%s' % (current_word, current_count))

#!/usr/bin/env python3
"""mapper.py"""
import sys

for line in sys.stdin:
    line = line.strip()
    words = line.split()
    for word in words:
        print('%s\t1' % word)