#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  long long n;
  cin >> n;
  bool bad = 0;
  map<long long, long long> cnt;
  long long xx[n];
  for (long long i = 0; i < n; i++) {
    long long x;
    cin >> x;
    xx[i] = x;
    cnt[x]++;
    if (cnt[x] >= 2 && x == 0) {
      bad = 1;
    }
    if (cnt[x] >= 3) {
      bad = 1;
    }
  }
  long long coun = 0;
  long long sum = 0;
  for (long long i = 0; i < n; i++) {
    if (cnt[xx[i]] > 1) {
      if (cnt[xx[i] - 1]) {
        cout << "cslnb" << endl;
        return 0;
      }
      coun++;
      cnt[xx[i]]--;
      xx[i]--;
      cnt[xx[i]]++;
      sum++;
    }
  }
  if (coun > 1 || bad) {
    cout << "cslnb" << endl;
    return 0;
  }
  sort(xx, xx + n);
  for (long long i = 0; i < n; i++) {
    sum += xx[i] - i;
  }
  if (sum % 2) {
    cout << "sjfnb" << endl;
  } else {
    cout << "cslnb" << endl;
  }
  return 0;
}
