public static void main ( String [ ] args ) throws IOException {
  Scanner input = new Scanner ( System . in ) ;
  int n , k ;
  n = input . nextInt ( ) ;
  k = input . nextInt ( ) ;
  char a [ ] [ ] = new char [ n ] [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    Arrays . fill ( a [ i ] , 'S' ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( k == 0 ) break ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( k == 0 ) break ;
      if ( ( i + j ) % 2 == 0 ) {
        a [ i ] [ j ] = 'L' ;
        k -- ;
      }
    }
  }
  if ( k > 0 ) {
    System . out . println ( "NO" ) ;
    return ;
  }
  System . out . println ( "YES" ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      System . out . print ( a [ i ] [ j ] ) ;
    }
    System . out . println ( ) ;
  }
}

public static void main ( String [ ] args ) throws IOException { Scanner input = new Scanner ( System . in ) ; int n , k ; n = input . nextInt ( ) ; k = input . nextInt ( ) ; char a [ ] [ ] = new char [ n ] [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { Arrays . fill ( a [ i ] , ' S ' ) ; } for ( int i = 0 ; i < n ; i ++ ) { if ( k == 0 ) break ; for ( int j = 0 ; j < n ; j ++ ) { if ( k == 0 ) break ; if ( ( i + j ) % 2 == 0 ) { a [ i ] [ j ] = ' L ' ; k -- ; } } } if ( k > 0 ) { System . out . println ( " NO " ) ; return ; } System . out . println ( " YES " ) ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { System . out . print ( a [ i ] [ j ] ) ; } System . out . println ( ) ; } }
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