#include <bits/stdc++.h>
using namespace std;

int kado( int x, int y, int z ){
  if( x == y or y == z or z == x )
    return 0;
  if( not ( min( { x, y, z } ) == y or max( { x, y, z } ) == y ) )
    return 0;
  return 1;
}

tuple< int, int, int > dfs( const vector< int > &a ){
  if( a.empty() )
    return make_tuple( -1, -1, -1 );
  for( int i = 0; i < a.size(); ++i )
    for( int j = i + 1; j < a.size(); ++j )
      for( int k = j + 1; k < a.size(); ++k )
        if( kado( a[ i ], a[ j ], a[ k ] ) ){
          vector< int > t = a;
          t.erase( remove( t.begin(), t.end(), a[ i ] ), t.end() );
          t.erase( remove( t.begin(), t.end(), a[ j ] ), t.end() );
          t.erase( remove( t.begin(), t.end(), a[ k ] ), t.end() );
          tuple< int, int, int > u = dfs( t );
          if( get< 0 >( u ) == -1 )
            return make_tuple( i, j, k );
        }
  return make_tuple( -1, -1, -1 );
}

signed main(){
  int N; cin >> N;
  vector< int > A( N );
  for( int i = 0; i < N; ++i )
    cin >> A[ i ];
  int a, b, c; tie( a, b, c ) = dfs( A );
  if( a == -1 )
    cout << a << endl;
  else
    cout << a << " " << b << " " << c << endl;
  return 0;
}