#!/usr/bin/env python
import sys
curr_word = None
curr_count = 0
# Process each key-value pair from the mapper
for line in sys.stdin:
  # Get the key and value from the current line
  word, count = line.split('\t')
  # Convert the count to an int
  count = int(count)
  # If the current word is the same as the previous word,
  # increment its count, otherwise print the words count
  # to stdout
  if word == curr_word:
    curr_count += count
  else:
    # Write word and its number of occurrences as a key-value
    # pair to stdout
    if curr_word:
      print ('{0}\t{1}'.format(curr_word, curr_count))
    curr_word = word
    curr_count = count
# Output the count for the last word
if curr_word == word:
  print ('{0}\t{1}'.format(curr_word, curr_count))