#include <bits/stdc++.h>
using namespace std;
long long n, sum = 0;
long long same = 0;
set<int> s;
int temp;
int main() {
  int numz = 0;
  cin >> n;
  if (n == 1) {
    int r;
    cin >> r;
    if (r % 2 == 0)
      printf("cslnb");
    else
      printf("sjfnb");
    return 0;
  }
  bool flag = true;
  for (int i = 0; i < n; i++) {
    int r;
    cin >> r;
    if (s.count(r)) same++;
    if (same == 1 && flag) {
      temp = r;
      flag = false;
    } else
      s.insert(r);
    if (r == 0) numz++;
    sum += r;
  }
  if (s.count(temp - 1) && same == 1) {
    printf("cslnb");
    return 0;
  }
  if (numz >= 2 || same >= 2) {
    printf("cslnb");
    return 0;
  } else {
    long long gap = n * (n - 1) / 2 - sum;
    if (gap % 2)
      printf("sjfnb");
    else
      printf("cslnb");
  }
  return 0;
}
