#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  sort(a.begin(), a.end());
  long long cnt = 0;
  long long ccc = 0;
  for (int i = 0; i < n; i++) {
    cnt += (long long)(a[i] - i);
    if (i > 1) {
      if (a[i] == a[i - 1] && a[i] == a[i - 2]) {
        cout << "cslnb";
        return 0;
      }
      if (a[i] == a[i - 1] && a[i] == a[i - 2] + 1) {
        cout << "cslnb";
        return 0;
      }
    }
    if (i > 0) {
      if (a[i] == a[i - 1] && a[i] == 0) {
        cout << "cslnb";
        return 0;
      }
      if (a[i] == a[i - 1]) {
        ccc++;
      }
    }
  }
  if (ccc > 1) {
    cout << "cslnb";
    return 0;
  }
  if (cnt == 0) {
    cout << "cslnb";
    return 0;
  }
  if (cnt % 2 == 0) {
    cout << "cslnb";
  } else {
    cout << "sjfnb";
  }
  return 0;
}
