import java.util.LinkedHashMap;
import java.util.Scanner;

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

        LinkedHashMap<String, Integer> quanity = new LinkedHashMap<>();

        String input = "";

        while (!"stop".equals(input = scanner.nextLine())) {
            String resourse = input;
            int material = Integer.parseInt(scanner.nextLine());

            if (!quanity.containsKey(resourse)) {
                quanity.put(resourse, material);
            } else {
                quanity.put(resourse, quanity.get(resourse) + material);
            }
        }
        quanity.forEach((key, value) -> {
            System.out.println(String.format("%s -> %d", key, value));
        });


    }
}