3
2 1 1
 6
6 2 6 2 4 2
 2
1 2
 8
2 1 2 2 6 5 6 6
 18
2 3 4 5 2 7 8 9 10 7 11 12 14 15 13 17 18 18
 7
1 2 3 4 5 6 7
 7
4 3 2 6 3 5 2
 7
7 5 3 1 2 1 5
 7
1 6 4 4 5 6 7

1
2 2 1  0
6 2 6 2 4 2  1 
1 1 
 2 
2 2 2 2 6 2 6 6 
 5 
2 3 4 5 11 7 8 9 10 11 11 11 14 15 11 17 18 11 
 6 
1 1 1 1 1 1 1 
 1
4 3 3 6 3 5 2  1
7 5 3 1 3 1 5  4 
1 6 4 1 1 1 1 

#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;
}
