package binocla;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class Solution {
    public static void main(String[] args) throws ParseException {
        Scanner in = new Scanner(System.in);
        String s = ""; // Для ввода данных

        HashMap<Date, Integer> customerProperties;
        HashMap<String, HashMap<Date, Integer>> customer = new HashMap<>();

        HashMap<String, Integer> itemProperties;
        HashMap<String, HashMap<String, Integer>> item = new HashMap<>();

        HashMap<String, String> shopProperties;
        HashMap<String, HashMap<String, String>> shop = new HashMap<>();

        HashMap<Date, String> buyProperties;
        HashMap<String, HashMap<Date, String>> buySettings = new HashMap<>();
        HashMap<String, HashMap<String, HashMap<Date, String>>> buy = new HashMap<>();



        while (!s.contains("$")) { // До тех пор, пока строка не содержит $
            s = in.nextLine();
            String[] v = s.split(" ");
            if (v[0].equals("c")) {
                customerProperties = customer.get(v[1]);
                if (customerProperties == null) {
                    customerProperties = new HashMap<>();
                }
                customerProperties.put(new SimpleDateFormat("yyyy-mm-dd").parse(v[2]), Integer.parseInt(v[3]));
                customer.put(v[1], (HashMap<Date, Integer>) customerProperties.clone());
            }
            if (v[0].equals("i")) {
                itemProperties = item.get(v[1]);
                if (itemProperties == null) {
                    itemProperties = new HashMap<>();
                }
                itemProperties.put(v[2], Integer.parseInt(v[3]));
                item.put(v[1], (HashMap<String, Integer>) itemProperties.clone());
            }
            if (v[0].equals("s")) {
                shopProperties = shop.get(v[1]);
                if (shopProperties == null) {
                    shopProperties = new HashMap<>();
                }
                shopProperties.put(v[2], v[3]);
                shop.put(v[1], (HashMap<String, String>) shopProperties.clone());
            }
            if (v[0].equals("b")) {
                buyProperties = buySettings.get(v[3]);
                if (buyProperties == null) {
                    buyProperties = new HashMap<>();
                }
                buySettings = buy.get(v[2]);
                if (buySettings == null) {
                    buySettings = new HashMap<>();
                }
                buyProperties.put(new SimpleDateFormat("yyyy-mm-dd").parse(v[1]), v[3]);
                buySettings.put(v[4], (HashMap<Date, String>) buyProperties.clone());
                buy.put(v[2], (HashMap<String, HashMap<Date, String>>) buySettings.clone());
            }
        }
        // System.out.println(customer);
        // System.out.println(item);
        ArrayList<String> ar = new ArrayList<>();
        for (Map.Entry<String, HashMap<String, Integer>> z: item.entrySet()) {
            ar.add(z.getValue().keySet().toArray()[0].toString());
        }
        Set<String> set = new HashSet<>(ar);
        if (ar.size() != set.size()) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
        // System.out.println(shop);
        // System.out.println(buy);

    }
}