#include <bits/stdc++.h>
using namespace std;
void dynamic() {
  int n;
  cin >> n;
  set<long long int> s;
  long long int a[n];
  map<long long int, int> hash;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    s.insert(a[i]);
    hash[a[i]]++;
  }
  if (s.size() < n - 1) {
    cout << "cslnb"
         << "\n";
    return;
  }
  bool flag = false;
  if (s.size() == n - 1) {
    long long int yo;
    for (auto it : s) {
      if (hash[it] > 1) {
        if (s.count(it - 1) || it == 0) {
          cout << "cslnb"
               << "\n";
          return;
        } else {
          yo = it - 1;
          break;
        }
      }
    }
    s.insert(yo);
    flag = true;
  }
  int gap = 0;
  long long int ind = 0;
  for (auto it : s) {
    gap += it - ind;
    ind++;
  }
  if (flag) gap++;
  if (gap % 2) {
    cout << "sjfnb"
         << "\n";
    return;
  } else {
    cout << "cslnb"
         << "\n";
    return;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  t = 1;
  while (t--) {
    dynamic();
  }
}
