#include <bits/stdc++.h>
using namespace std;
void getint(int &v) {
  char ch, fu = 0;
  for (ch = '*'; (ch < '0' || ch > '9') && ch != '-'; ch = getchar())
    ;
  if (ch == '-') fu = 1, ch = getchar();
  for (v = 0; ch >= '0' && ch <= '9'; ch = getchar()) v = v * 10 + ch - '0';
  if (fu) v = -v;
}
int n, a[500010], t, ans;
int main() {
  cin >> n;
  for (int i = 1; i <= n; ++i) getint(a[i]);
  sort(a + 1, a + n + 1);
  for (int i = 1; i <= n - 1; ++i)
    if (a[i] == a[i + 1]) {
      if (t) return puts("cslnb"), 0;
      t = i;
    }
  if (t) {
    if (t == 1) {
      if (a[t] == 0) return puts("cslnb"), 0;
      --a[t];
    } else {
      if (a[t] == a[t - 1] + 1) return puts("cslnb"), 0;
      --a[t];
    }
    for (int i = 1; i <= n; ++i) (ans += a[i] - (i - 1)) %= 2;
    if (ans & 1)
      puts("cslnb");
    else
      puts("sjfnb");
    return 0;
  }
  for (int i = 1; i <= n; ++i) (ans += a[i] - (i - 1)) %= 2;
  if (ans % 2 == 0)
    puts("cslnb");
  else
    puts("sjfnb");
  return 0;
}
