#include <bits/stdc++.h>
using namespace std;
map<long long, long long> cnt;
signed main() {
  long long n;
  cin >> n;
  for (long long i = 0; i < n; i++) {
    long long in;
    cin >> in;
    cnt[in]++;
  }
  long long sum = -n * (n - 1) / 2;
  for (auto i : cnt) sum += i.second * i.first;
  long long flag = 0;
  if (cnt[0] > 1) flag = 1;
  for (auto i : cnt)
    if (i.second > 2) flag = 1;
  long long cnt1cnt = 0;
  for (auto i : cnt)
    if (i.second > 1) cnt1cnt++;
  if (cnt1cnt >= 2) flag = 1;
  for (auto i : cnt)
    if (i.second > 1 && cnt[i.first - 1] > 0) flag = 1;
  if (flag)
    cout << "cslnb\n";
  else {
    if (sum & 1)
      cout << "sjfnb\n";
    else
      cout << "cslnb\n";
  }
}
