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

public class Guess
{
	int[] ans = new int[4];

	public Guess() {
		Random r = new Random();
		do {
			for(int i = 0; i < 4; i++)
				ans[i] = r.nextInt( 10 );
		} while (ans[1] == ans[0] || ans[2] == ans[0] || ans[2] == ans[1] || ans[3] == ans[0] || ans[3] == ans[1] || ans[3] == ans[2]);
		System.out.println(Integer.toString(ans[0]) + Integer.toString(ans[1]) + Integer.toString(ans[2]) + Integer.toString(ans[3]));
	}

	public String guess(String u) {
		int i, j, num, a = 0, b = 0;
		int[] user = new int[4];
		num = Integer.parseInt(u);

		for(i = 3; i >= 0; i--) {
			user[i] = num % 10;
			num /= 10;
		}

		for(i = 0; i < 4; i++) {
			for(j = 0; j < 4; j++) {
				if(ans[i] == user[j]) {
					if(i == j) {
						a++;
					} else {
						b++;
					}
				}
			}
		}
		return (Integer.toString(a) + "A" + Integer.toString(b) + "B");
	}
}