#include <bits/stdc++.h>
using namespace std;
const int inf = 1000000007;
const long long INF = 1e18;
int mod = 1000000007;
template <typename T1, typename T2>
inline bool chmin(T1& a, T2 b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T1, typename T2>
inline bool chmax(T1& a, T2 b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
long long gcd(long long a, long long b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }
template <typename T, typename U>
T pow_(T a, U b) {
  return b ? pow_(a * a, b / 2) * (b % 2 ? a : 1) : 1;
}
long long modpow(long long a, long long b, long long _mod) {
  return b ? modpow(a * a % _mod, b / 2, _mod) * (b % 2 ? a : 1) % _mod : 1;
}
template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
  os << p.first << " " << p.second;
  return os;
}
template <class T>
ostream& operator<<(ostream& os, const vector<T>& vec) {
  for (int i = 0; i < ((int)vec.size()); ++i) {
    if (i) os << " ";
    os << vec[i];
  }
  return os;
}
template <typename T>
inline istream& operator>>(istream& is, vector<T>& v) {
  for (int j = 0; j < ((int)v.size()); ++j) is >> v[j];
  return is;
}
template <class T, class T2>
inline void add(T& a, T2 b) {
  a += b % mod;
  if (a >= mod) a -= mod;
}
template <class T>
void operator+=(vector<T>& v, vector<T> v2) {
  for (int i = 0; i < ((int)v2.size()); ++i) v.emplace_back(v2[i]);
}
void solve();
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cout << fixed << setprecision(12);
  int T;
  T = 1;
  while (T--) solve();
}
void solve() {
  int n, p;
  cin >> n >> p;
  vector<int> a(n);
  cin >> a;
  sort(a.begin(), a.end());
  vector<int> ans;
  for (int x = 1; x < (*max_element(a.begin(), a.end())); ++x) {
    if (x < a[0]) continue;
    int cnt = (int)(lower_bound(a.begin(), a.end(), x) - a.begin());
    long long tmp = 1;
    for (int i = 0; i < (n); ++i) {
      cnt += (int)(upper_bound(a.begin(), a.end(), x + i) - a.begin()) -
             (int)(lower_bound(a.begin(), a.end(), x + i) - a.begin());
      (tmp *= cnt) %= p;
      if (cnt) --cnt;
    }
    if (tmp) ans.emplace_back(x);
  }
  cout << (int)ans.size() << '\n' << ans << '\n';
}
