Submission #432698

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Source Code Expand

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            char[] c = br.readLine().toCharArray();
            int N = Integer.parseInt(br.readLine());
            List<String> list = new ArrayList<String>();
            for (int i = 0; i < c.length; i++) {
                for (int j = 0; j < c.length; j++) {
                    list.add(Character.toString(c[i])
                            + Character.toString(c[j]));
                }
            }
            Collections.sort(list);

            System.out.println(list.get(N - 1));
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("Error:" + e.getMessage());
        }
    }

}

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