public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  int t = 1 ;
  while ( t -- > 0 ) {
    int n = Integer . parseInt ( br . readLine ( ) . trim ( ) ) ;
    int a [ ] = new int [ n ] ;
    String str [ ] = br . readLine ( ) . trim ( ) . split ( " " ) ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      a [ i ] = Integer . parseInt ( str [ i ] ) ;
    }
    int find = 1 ;
    ArrayList < Integer > li = new ArrayList < > ( ) ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( a [ i ] == find ) {
        li . add ( 2001 + i ) ;
        find ++ ;
      }
    }
    pw . println ( li . size ( ) ) ;
    for ( int x : li ) pw . print ( x + " " ) ;
  }
  pw . flush ( ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; PrintWriter pw = new PrintWriter ( System . out ) ; int t = 1 ; while ( t -- > 0 ) { int n = Integer . parseInt ( br . readLine ( ) . trim ( ) ) ; int a [ ] = new int [ n ] ; String str [ ] = br . readLine ( ) . trim ( ) . split ( " ▁ " ) ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = Integer . parseInt ( str [ i ] ) ; } int find = 1 ; ArrayList < Integer > li = new ArrayList < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( a [ i ] == find ) { li . add ( 2001 + i ) ; find ++ ; } } pw . println ( li . size ( ) ) ; for ( int x : li ) pw . print ( x + " ▁ " ) ; } pw . flush ( ) ; }
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