source_code: import java.util.*;
  public class Main{
      public static void main(String args[]){
       Scanner sc=new Scanner(System.in);
      int n=sc.nextInt();
      int a[]=new int[n];
      for(int i=0;i<n;i++)
      a[i]=sc.nextInt();
      Arrays.sort(a);
      //boolean 
      int t=1,c=0;
      for(int i=1;i<n;i++){
          if(a[i]==a[i-1])
          {
              if(i-2>=0&&a[i-2]==a[i-1]-1){
                  System.out.println("cslnb");
                  return;
              }
              c++;
          }
          if(a[i]==a[i-1]&&a[i]==0){
          System.out.println("cslnb");
          return;
          }
      }
      if(c>1)
      {
          System.out.println("cslnb");
          return;
      }
      for(int i=0;i<n;i++){
          if((a[i]-i)%2!=0)
          t=t^1;
      }
      if(t==1)
      System.out.println("cslnb");
      else
      System.out.println("sjfnb");
      
      
      
      }
      
  }