source_code: 
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.util.StringTokenizer;
  
  /*
   * To change this license header, choose License Headers in Project Properties.
   * To change this template file, choose Tools | Templates
  744444444747477777774
  44444447474747777777
   */
  
  /**
   *
   * @author Andy Phan
   */
  public class b {
      public static void main(String[] args) {
          FS in = new FS(System.in);
          PrintWriter out = new PrintWriter(System.out);
          
          int n = in.nextInt();
          Integer[] arr = new Integer[n];
          int numZ = 0;
          for(int i = 0; i < n; i++) {
              arr[i] = in.nextInt();
              if(arr[i] == 0) numZ++;
          }
          
          Arrays.sort(arr);
          
          
          if(numZ > 1) {
              System.out.println("cslnb");
              return;
          }
          int numDup = 0;
          int[] arr2 = new int[n];
          for(int i = 0; i < n; i++) {
              arr2[i] = arr[i];
              if(i != 0) {
                  if(arr2[i] == arr2[i-1]) {
                      arr2[i-1]--;
                      numDup++;
                  }
              }
          }
          
          if(numDup > 1) {
              System.out.println("cslnb");
              return;
          }
          
          
          for(int i = 0; i < n; i++) {
              if(i != 0) {
                  if(arr2[i] == arr2[i-1]) {
                      System.out.println("cslnb");
                      return;
                  }
              }
          }
          long num = 0;
          if(numDup == 1) num++;
          for(int i = 0; i < n; i++) {
              num += arr2[i]-i;
          }
          
          if(num%2 == 0) {
              System.out.println("cslnb");
          } else {
              System.out.println("sjfnb");
          }
          
  
          out.close();
      }
      
      static class FS {
  
          BufferedReader in;
          StringTokenizer token;
          
          public FS(InputStream str) {
              in = new BufferedReader(new InputStreamReader(str));
          }
          
          public String next() {
              if (token == null || !token.hasMoreElements()) {
                  try {
                      token = new StringTokenizer(in.readLine());
                  } catch (IOException ex) {
                  }
                  return next();
              }
              return token.nextToken();
          }
          
          public int nextInt() {
              return Integer.parseInt(next());
          }
      }
  }
  