#include <iostream>
#include <sstream>
#include <queue>
#include <unordered_map>


void populateMap( std::unordered_map<std::string, int> &inputMap,
                 std::string& resource, int& value,
                 std::queue<std::string>& inputQueue)
{
    if(inputMap.find(resource)==inputMap.end())
    {
        inputQueue.push(resource);
    }
    inputMap[resource]+=value;



}

main(){

    std::unordered_map<std::string, int> inputMap;
    std::queue<std::string> inputQueue;

    std::string resource;

    int value;

    while(true)
    {
        std::cin>>resource;
        if(resource=="stop")
        {
            break;
        }
        std::cin>>value;
        populateMap(inputMap,resource ,value,inputQueue);

    }

    while(!inputQueue.empty())
    {
            std::string key=inputQueue.front();

            std::cout<< key <<" -> " <<
             inputMap[key] <<std::endl;
             inputQueue.pop();
    }



}