#include <bits/stdc++.h>
using namespace std;
long long int power(long long int x, long long int y, long long int p) {
  long long int res = 1;
  x = x % p;
  while (y > 0) {
    if (y & 1) res = (res * x) % p;
    y = y >> 1;
    x = (x * x) % p;
  }
  return res;
}
int main() {
  long long int n;
  cin >> n;
  vector<long long int> v(n);
  set<long long int> s;
  for (long long int i = 0; i < n; i++) {
    cin >> v[i];
    s.insert(v[i]);
  }
  sort(v.begin(), v.end());
  string s1;
  long long int count = 0, temp = 0;
  if (v.size() - 1 > s.size())
    cout << "cslnb" << endl;
  else {
    if (v.size() - 1 == s.size()) {
      for (long long int i = 0; i < n - 1; i++) {
        if (v[i] == v[i + 1]) {
          if (v[i] == 0) {
            cout << "cslnb" << endl;
            temp = 1;
            break;
          } else if (v[i - 1] == v[i] - 1) {
            cout << "cslnb" << endl;
            temp = 1;
            break;
          } else {
            v[i] = v[i] - 1;
            count++;
          }
        }
      }
    }
    for (long long int i = 0; i < n; i++) {
      count += v[i] - i;
    }
    if ((count % 2 == 0) && (temp != 1))
      cout << "cslnb" << endl;
    else if ((count % 2 != 0) && (temp != 1))
      cout << "sjfnb" << endl;
  }
}
