#include <bits/stdc++.h>
using namespace std;
long long int n;
long long int arr[100005];
map<long long int, long long int> freq;
bool f1 = 0, f2 = 0;
int main() {
  cin >> n;
  for (long long int i = 0; i < n; i++) {
    cin >> arr[i];
    freq[arr[i]]++;
    if (freq[arr[i]] > 1) {
      if (f1)
        f2 = 1;
      else
        f1 = 1;
    }
  }
  long long int f3 = 0;
  for (long long int i = 0; i < n; i++)
    if (freq[arr[i]] > 1 && freq[arr[i] - 1] > 0) f3 = 1;
  if ((f1 && f2) || freq[0] > 1 || f3) {
    cout << "cslnb";
    return 0;
  }
  sort(arr, arr + n);
  long long int ans = 0;
  for (long long int i = 0; i < n; i++) {
    if (i > arr[i]) break;
    ans += (arr[i] - i);
  }
  if (ans % 2)
    cout << "sjfnb";
  else
    cout << "cslnb";
}
