import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;

public class Demo {
    final static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        miner();
    }

    private static void miner() {
        Map<String, Integer> minerResource = new LinkedHashMap<>();
        while (true) {
            String key = scanner.nextLine();
            if (key.equals("stop")) {
                for (Entry<String, Integer> element : minerResource.entrySet()) {
                    System.out.println(element.getKey() + " -> " + element.getValue());
                }
                return;
            } else {
                int value = Integer.parseInt(scanner.nextLine());
                if (!minerResource.containsKey(key)) {
                    minerResource.put(key, value);
                } else {
                    int n = minerResource.get(key);
                    n += value;
                    minerResource.put(key, n);
                }
            }
        }
    }
}