#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using ll = long long;

#define TYPE_OF( VAR ) remove_const<remove_reference<decltype( VAR )>::type >::type
#define UNTIE ios_base::sync_with_stdio( false ); cin.tie( nullptr ) 
#define CIN( LL , A ) LL A; cin >> A 
#define ASSERT( A , MIN , MAX ) assert( MIN <= A && A <= MAX ) 
#define CIN_ASSERT( A , MIN , MAX ) CIN( TYPE_OF( MAX ) , A ); ASSERT( A , MIN , MAX ) 
#define FOREQ( VAR , INITIAL , FINAL ) for( TYPE_OF( FINAL ) VAR = INITIAL ; VAR <= FINAL ; VAR ++ ) 
#define QUIT return 0 

#include <cassert>

#define MAIN main

int MAIN()
{
  UNTIE;
  constexpr const int bound = 100;
  CIN_ASSERT( N , 2 , bound );
  int P[bound + 2];
  FOREQ( i , 1 , N ){
    cin >> P[i];
  }
  P[N+1] = 0;
  bool used[bound + 2] = {};
  int answer[ 2 * bound * bound ];
  int num = 0;
  int j , k;
  FOREQ( i , 1 , N ){
    j = P[i];
    while( used[i] || j == i ){
      i++;
      j = P[i];
    }
    if( i <= N ){
      used[i] = true;
      while( j != i ){
	used[j] = true;
	k = i - 1;
	while( ++k < j ){
	  answer[num] = k;
	  num++;
	}
	k--;
	while( --k >= i){
	  answer[num] = k;
	  num++;
	}
	j = P[j];
      }
    }
  }
  cout << "Yes\n";
  cout << num << "\n";
  j = -1;
  while( ++j < num ){
    cout << answer[j] << "\n";
  }
  QUIT;
}