#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int arr[n];
  for (int i = 0; i < n; i++) cin >> arr[i];
  for (int i = 1; i < n - 1; i++) {
    if (arr[0] > arr[i] && arr[i] < arr[i + 1]) {
      cout << 3 << endl;
      cout << 1 << " " << i + 1 << " " << i + 2 << endl;
      return 0;
    }
    if (arr[0] < arr[i] && arr[i] > arr[i + 1]) {
      cout << 3 << endl;
      cout << 1 << " " << i + 1 << " " << i + 2 << endl;
      return 0;
    }
  }
  cout << 0 << endl;
  return 0;
}
