#include <bits/stdc++.h>
using namespace std;
const long long logN = 20;
const long long N = 100005;
const long long M = 1000000007;
const long long INF = 1e12;
const long long dx[4] = {1, 0, -1, 0};
const long long dy[4] = {0, 1, 0, -1};
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long n;
  cin >> n;
  long long A[n];
  for (long long i = 0; i < n; i++) cin >> A[i];
  sort(A, A + n);
  long long cnt = 0, cur = 0;
  long long a = 0;
  for (long long i = 0; i < n; i++) {
    if (i != 0) {
      if (A[i] == A[i - 1]) {
        a++;
        if (i != 1) {
          if (A[i - 2] == A[i - 1] - 1) {
            cout << "cslnb"
                 << "\n";
            return 0;
          }
        }
        if (i == 1 and A[0] == 0) {
          cout << "cslnb"
               << "\n";
          return 0;
        }
      }
    }
    if (A[i] >= cur) {
      cnt += (A[i] - cur);
      cur++;
    }
  }
  if (a >= 2) {
    cout << "cslnb"
         << "\n";
  } else if (cnt % 2 == 0) {
    cout << "cslnb"
         << "\n";
  } else {
    cout << "sjfnb"
         << "\n";
  }
  return 0;
}
