#include <bits/stdc++.h>
using namespace std;
template <class T>
inline void read(T &x) {
  x = 0;
  int c = getchar(), f = 1;
  for (; !isdigit(c); c = getchar())
    if (c == 45) f = -1;
  for (; isdigit(c); c = getchar()) (x *= 10) += f * (c - '0');
}
int n, a[100000 + 5], c;
long long s;
int main() {
  read(n);
  for (int i = 1; i <= n; i++) read(a[i]), s += a[i];
  a[0] = -0x3f3f3f3f, sort(a + 1, a + n + 1);
  for (int i = 1; i < n; i++)
    if (a[i] == a[i + 1])
      if (a[i] == 0 || a[i - 1] + 1 == a[i] || ++c > 1) return puts("cslnb"), 0;
  return puts((s - 1LL * n * (n - 1) / 2) & 1 ? "sjfnb" : "cslnb"), 0;
}
