#!/usr/bin/python
import sys
ss={}
n=0
for l in sys.stdin:
  (count,key)=l.strip().split()
  ss[key]=ss.get(key,0)+int(count)
  n+=1
tt=0
for (key,total) in ss.items():
  tt+=total
  print "%s\t%s"%(key,total)
print >>sys.stderr,"%s vs. %s"%(n,tt)