public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = Integer . parseInt ( scanner . nextLine ( ) ) ;
  char [ ] [ ] s = new char [ n ] [ n ] ;
  int [ ] a = new int [ n ] ;
  int [ ] dp = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) s [ i ] = scanner . nextLine ( ) . toCharArray ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) a [ i ] = scanner . nextInt ( ) ;
  StringBuilder sb = new StringBuilder ( ) ;
  int count = 0 ;
  while ( true ) {
    int zero = - 1 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( a [ i ] == dp [ i ] ) {
        zero = i ;
        break ;
      }
    }
    if ( zero < 0 ) break ;
    count ++ ;
    sb . append ( zero + 1 ) . append ( " " ) ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( s [ zero ] [ j ] == '1' ) dp [ j ] ++ ;
    }
  }
  sb . append ( "\n" ) ;
  System . out . println ( count ) ;
  System . out . println ( sb ) ;
  scanner . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = Integer . parseInt ( scanner . nextLine ( ) ) ; char [ ] [ ] s = new char [ n ] [ n ] ; int [ ] a = new int [ n ] ; int [ ] dp = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) s [ i ] = scanner . nextLine ( ) . toCharArray ( ) ; for ( int i = 0 ; i < n ; i ++ ) a [ i ] = scanner . nextInt ( ) ; StringBuilder sb = new StringBuilder ( ) ; int count = 0 ; while ( true ) { int zero = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( a [ i ] == dp [ i ] ) { zero = i ; break ; } } if ( zero < 0 ) break ; count ++ ; sb . append ( zero + 1 ) . append ( " ▁ " ) ; for ( int j = 0 ; j < n ; j ++ ) { if ( s [ zero ] [ j ] == '1' ) dp [ j ] ++ ; } } sb . append ( " \n " ) ; System . out . println ( count ) ; System . out . println ( sb ) ; scanner . close ( ) ; }
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