#!/usr/bin/env python
import sys
last_key = None
running_total = 0
for input_line in sys.stdin:
	input_line = input_line.strip()
	this_key,value = input_line.split("\t",1)
	value = int(value)
	if last_key == this_key:
		running_total += value
	else:
		if last_key:
			print("{0}\t{1}".format(last_key,running_total))
		running_total = value	
		last_key = this_key
if last_key == this_key:
	print("{0}\t{1}".format(last_key,running_total))
