package Exercice;

import java.util.*;

public class MinerTask_06 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);


        Map<String,Integer> resources=new LinkedHashMap<>();


        String input;

        int count = 0;
        while (!"stop".equals(input=scanner.nextLine())){
            if (count%2==0){
                if (!resources.containsKey(input)){
                    resources.put(input,scanner.nextInt());
                }else {
                    resources.put(input,resources.get(input)+scanner.nextInt());
                }
            }
            count++;
        }

        for (Map.Entry<String,Integer> kvp : resources.entrySet()){
            System.out.println(String.format(
                    "%s -> %d",kvp
                    .getKey(),kvp.getValue()
            ));
        }
    }

}