#include <bits/stdc++.h>
using namespace std;
void $main() {
  long long n;
  cin >> n;
  vector<long long> a(n);
  for (auto &x : a) cin >> x;
  sort(a.begin(), a.end());
  long long can = 0;
  for (long long i = 0; i < n; i++) {
    if (a[i] > 0) {
      can++;
    }
  }
  if (can == 0) {
    cout << "cslnb";
    exit(0);
  }
  for (long long i = 2; i < n; i++) {
    if (a[i] == a[i - 1] && a[i - 1] == a[i - 2]) {
      cout << "cslnb";
      exit(0);
    }
  }
  long long cnt = 0;
  map<long long, long long> mapa;
  long long bad;
  for (long long i = 0; i < n; i++) {
    mapa[a[i]]++;
    if (mapa[a[i]] == 2) {
      cnt++;
      bad = a[i];
    }
  }
  if (cnt > 1) {
    cout << "cslnb";
    exit(0);
  }
  long long step = 0;
  if (cnt == 1) {
    if (bad == 0) {
      cout << "cslnb";
      exit(0);
    }
    mapa[bad]--;
    mapa[bad - 1]++;
    if (mapa[bad - 1] > 1) {
      cout << "cslnb";
      exit(0);
    }
    step++;
    for (long long i = 0; i < n; i++) {
      if (a[i] == bad) {
        a[i]--;
        break;
      }
    }
  }
  sort(a.begin(), a.end());
  for (long long i = 0; i < n; i++) {
    step += (a[i] - i);
  }
  cout << (step % 2 == 0 ? "cslnb" : "sjfnb");
}
signed main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  $main();
  return 0;
}
