#include <bits/stdc++.h>
using namespace std;
int color[200001];
int root;
int save[200001];
vector<int> data[200001];
int changes;
void dfs(int source) {
  color[source] = 1;
  int len = data[source].size();
  for (int i = 0; i < len; i++) {
    if (source == data[source][i]) {
      if (root == 0)
        root = source;
      else if (root != source) {
        save[source] = root;
        changes++;
      }
    } else if (color[data[source][i]] == 0) {
      dfs(data[source][i]);
    } else if (color[data[source][i]] == 1) {
      if (root == 0) root = source;
      save[source] = root;
      changes++;
    }
  }
  color[source] = 2;
}
int main(void) {
  ios::sync_with_stdio(0);
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> save[i];
    data[i].push_back(save[i]);
    if (root == 0 && i == save[i]) root = i;
  }
  for (int i = 1; i <= n; i++) {
    if (color[i] == 0) dfs(i);
  }
  cout << changes << "\n";
  for (int i = 1; i <= n; i++) cout << save[i] << ' ';
  cout << "\n";
  return 0;
}
