public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int R = sc . nextInt ( ) ;
  int C = sc . nextInt ( ) ;
  int sy = sc . nextInt ( ) - 1 ;
  int sx = sc . nextInt ( ) - 1 ;
  int gy = sc . nextInt ( ) - 1 ;
  int gx = sc . nextInt ( ) - 1 ;
  String [ ] [ ] c = new String [ R ] [ C ] ;
  for ( int i = 0 ;
  i < R ;
  i ++ ) {
    c [ i ] = sc . next ( ) . split ( "" ) ;
  }
  Queue < Point > points = new ArrayDeque < Point > ( ) ;
  points . add ( new Point ( sy , sx , 0 ) ) ;
  c [ sy ] [ sx ] = "!" ;
  out . println ( bfs ( c , points , new Point ( gy , gx , - 1 ) ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int R = sc . nextInt ( ) ; int C = sc . nextInt ( ) ; int sy = sc . nextInt ( ) - 1 ; int sx = sc . nextInt ( ) - 1 ; int gy = sc . nextInt ( ) - 1 ; int gx = sc . nextInt ( ) - 1 ; String [ ] [ ] c = new String [ R ] [ C ] ; for ( int i = 0 ; i < R ; i ++ ) { c [ i ] = sc . next ( ) . split ( " " ) ; } Queue < Point > points = new ArrayDeque < Point > ( ) ; points . add ( new Point ( sy , sx , 0 ) ) ; c [ sy ] [ sx ] = " ! " ; out . println ( bfs ( c , points , new Point ( gy , gx , - 1 ) ) ) ; }
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