Bulls and Cows

import java.io.*;
import java.util.*;

public class Main {

    static class Guess {
        String s;
        int bulls, cows;
        Guess(String s, int b, int c) {
            this.s = s;
            this.bulls = b;
            this.cows = c;
        }
    }

    static int[] check(String a, String b) {
        int bulls = 0, cows = 0;
        boolean[] usedA = new boolean[4];
        boolean[] usedB = new boolean[4];

        for (int i = 0; i < 4; i++) {
            if (a.charAt(i) == b.charAt(i)) {
                bulls++;
                usedA[i] = usedB[i] = true;
            }
        }

        for (int i = 0; i < 4; i++) {
            if (usedA[i]) continue;
            for (int j = 0; j < 4; j++) {
                if (!usedB[j] && a.charAt(i) == b.charAt(j)) {
                    cows++;
                    usedB[j] = true;
                    break;
                }
            }
        }

        return new int[]{bulls, cows};
    }

    static boolean distinct(String s) {
        boolean[] seen = new boolean[10];
        for (int i = 0; i < 4; i++) {
            int d = s.charAt(i) - '0';
            if (seen[d]) return false;
            seen[d] = true;
        }
        return true;
    }

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine().trim());

        Guess[] guesses = new Guess[n];
        for (int i = 0; i < n; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            String s = st.nextToken();
            int b = Integer.parseInt(st.nextToken());
            int c = Integer.parseInt(st.nextToken());
            guesses[i] = new Guess(s, b, c);
        }

        List<String> valid = new ArrayList<>();

        for (int x = 0; x < 10000; x++) {
            String cand = String.format("%04d", x);
            if (!distinct(cand)) continue;

            boolean ok = true;
            for (Guess g : guesses) {
                int[] bc = check(cand, g.s);
                if (bc[0] != g.bulls || bc[1] != g.cows) {
                    ok = false;
                    break;
                }
            }
            if (ok) valid.add(cand);
        }

        if (valid.isEmpty()) {
            System.out.println("Incorrect data");
        } else if (valid.size() == 1) {
            System.out.println(valid.get(0));
        } else {
            System.out.println("Need more data");
        }
    }
}