import java.io.*;
import java.util.Set;
import java.util.TreeSet;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        String[] a=bf.readLine().split(" ");
        int m = Integer.parseInt(a[0]);
        int n = Integer.parseInt(a[1]);
        int s = Integer.parseInt(a[2]);
        String array[] = new String[m];
        Set<String> ar = new TreeSet<String>();

        for (int i = 0; i < m; i++) {
            array[i] = bf.readLine();
        }

        for (int i = s - 1; i < m; i += n) {
            if (ar.add(array[i])) {
                System.out.println(array[i]);
            } else {
                while (!ar.add(array[i])) {
                    i += 1;
                    if (i == m) return;
                }
                System.out.println(array[i]);
            }
        }

        if (ar.isEmpty()) {
            System.out.println("Keep going...");
            return;
        }
    }
}