source_code: import java.util.*;
  import java.io.*;
  public class C{
      static PrintWriter out;
      static InputReader in;
      public static void main(String args[]){
          out = new PrintWriter(System.out);
          in = new InputReader();
          new C();
          out.flush(); out.close();
      }   
      C(){
         int w = solve();
         out.print(w == 0 ? "sjfnb" : "cslnb");
      }
      int n;
      long a[];
      int solve(){
          n = in.nextInt(); a = new long[n];
          long sum = 0;
          for(int i = 0; i < n; i++)sum += a[i] = in.nextLong();
          if(sum == 0){
              return 1;
          }
          Arrays.sort(a);
          int c = 0, c0 = 0; long p = -1, max = 0;
          int f = 0;
          long t = -1; int pp = -1;
          for(int i = 0; i < n; i++){
              if(a[i] == p){
                  c++;
              }else{
                  if(p == 0)c0 = c;
                  if(c >= 2){f++; t = p; pp = i - 2;}
                  max = Math.max(max, c);
                  p = a[i];
                  c = 1;
              }
          }
          max = Math.max(max, c);
          sum = 0;
          if(c >= 2){f++; t = p; pp = n - 2;}
          if(max > 2 || c0 > 1 || f > 1)return 1;
          if(f == 1){
              long v = Arrays.binarySearch(a, t - 1);
              if(v >= 0)return 1;
              a[pp]--; sum = 1;
          }
  
          p = -1;
          for(int i = 0; i < n; i++){
              sum += a[i] - (p + 1);
              a[i] = p + 1;
              p = a[i];
          }
  
          return 1 - (int)(sum % 2);
      }
      public static class InputReader{
          BufferedReader br;
          StringTokenizer st;
          InputReader(){
              br = new BufferedReader(new InputStreamReader(System.in));
          }
          public int nextInt(){
              return Integer.parseInt(next());
          }
          public long nextLong(){
              return Long.parseLong(next());
          }
          public double nextDouble(){
              return Double.parseDouble(next());
          }
          public String next(){
              while(st == null || !st.hasMoreTokens()){
                  try{
                      st = new StringTokenizer(br.readLine());
                  }catch(IOException e){}
              }
              return st.nextToken();
          }
      }
  }
          