#include<stdio.h>
//#include<bits/stdc++.h>
#include<string.h>
#include<iostream>
#include<math.h>
#include<sstream>
#include<set>
#include<queue>
#include<map>
#include<vector>
#include<algorithm>
#include<limits.h>
#define inf 0x3fffffff
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define LL long long
using namespace std;
map<string,int>q;
struct P
{
    string s;
    int num;
}hehe[10000];
bool cmd(P x,P y)
{
    if(x.s<y.s)
        return 1;

    return 0;
}
int main()
{
   int t;
   int i;
   string s;
   int num;
   while(cin>>t)
   {
       for(i=0;i<t;i++)
       {
          cin>>hehe[i].s>>hehe[i].num;
          q[hehe[i].s]+=hehe[i].num;
       }
      // cout<<q.size()<<endl;
       map<string,int>::iterator it;
       for(it=q.begin();it!=q.end();it++)
       {
           cout<<it->first<<" "<<it->second<<endl;
       }
       q.clear();
   }
   return 0;
}