#include <bits/stdc++.h>
using namespace std;
const long long inf = 1e18;
const int nax = 1e5 + 200;
const double mpi = acos(-1);
const double eps = 1e-10;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cout << setprecision(20) << fixed;
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < (int)n; ++i) cin >> a[i];
  sort(a.begin(), a.end());
  map<int, int> fre;
  long long sum = 0;
  long long sum2 = 0;
  for (int i = 0; i < (int)n; ++i) {
    sum += a[i];
    sum2 += i;
    fre[a[i]]++;
    if (fre[a[i]] >= 3) {
      cout << "cslnb" << '\n';
      return 0;
    }
  }
  int cnt = 0;
  for (pair<int, int> a : fre) {
    if (a.second > 1) cnt++;
    if (a.second == 2 && fre[a.first - 1] > 0) {
      cout << "cslnb" << '\n';
      return 0;
    }
  }
  if (fre[0] == 2) {
    cout << "cslnb" << '\n';
    return 0;
  }
  if (cnt > 1) {
    cout << "cslnb" << '\n';
    return 0;
  }
  long long turnos = sum - sum2;
  if (!(turnos & 1)) {
    cout << "cslnb" << '\n';
  } else {
    cout << "sjfnb" << '\n';
  }
}
