import java.lang.reflect.Array;
import java.util.*;

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

        List<String> input = new ArrayList<>();
        String inputs = scanner.nextLine();

        while (!inputs.equals("stop")){
           int number = 0;
           input.add(number,inputs);
           number++;
           inputs = scanner.nextLine();
        }
        LinkedHashMap<String, Integer> miner = new LinkedHashMap<>();
        for (int i = input.size()-1; 0 <= i; i--) {
            if ( i % 2 != 0){
                miner.putIfAbsent(input.get(i),0);

            } else {
                Integer quantity = miner.get(input.get(i+1));
                miner.put(input.get(i+1),quantity + Integer.parseInt(input.get(i)));
            }

        }
        for (Map.Entry<String, Integer> entry : miner.entrySet()) {
            System.out.printf("%s -> %d%n",entry.getKey(),entry.getValue());
        }


    }
}