#include <bits/stdc++.h>
using namespace std;
inline void read(int &x) {
  char ch;
  bool flag = false;
  for (ch = getchar(); !isdigit(ch); ch = getchar())
    if (ch == '-') flag = true;
  for (x = 0; isdigit(ch); x = x * 10 + ch - '0', ch = getchar())
    ;
  x = flag ? -x : x;
}
const int INF = 0x3f3f3f3f;
int a[100005];
int main() {
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  sort(a + 1, a + n + 1);
  int f = 0;
  long long sum = 0;
  for (int i = 1; i <= n; i++) {
    sum += (a[i] - (i - 1));
    if (a[i] == a[i - 1] && i > 1) {
      if (a[i] == a[i - 1] && i > 2 && a[i] == (a[i - 2] + 1))
        f += 2;
      else
        f++;
    }
  }
  if (f >= 2 || (a[1] == a[2] && a[1] == 0)) {
    cout << "cslnb" << endl;
  } else {
    if (sum % 2) {
      cout << "sjfnb" << endl;
    } else {
      cout << "cslnb" << endl;
    }
  }
  return 0;
}
