public static void main ( String [ ] args ) throws IOException {
  InputStreamReader r = new InputStreamReader ( System . in ) ;
  BufferedReader br = new BufferedReader ( r ) ;
  String si = br . readLine ( ) ;
  String [ ] sa = si . split ( " " ) ;
  int n = Integer . valueOf ( sa [ 0 ] ) ;
  int m = Integer . valueOf ( sa [ 1 ] ) ;
  StringBuffer str = new StringBuffer ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String s = br . readLine ( ) ;
    for ( int j = 0 ;
    j < m ;
    j ++ ) {
      if ( s . charAt ( j ) == '-' ) {
        str . append ( "-" ) ;
      }
      else {
        if ( ( i + j ) % 2 == 0 ) {
          str . append ( "B" ) ;
        }
        else {
          str . append ( "W" ) ;
        }
      }
    }
    str . append ( "\n" ) ;
  }
  System . out . print ( str . toString ( ) ) ;
}

public static void main ( String [ ] args ) throws IOException { InputStreamReader r = new InputStreamReader ( System . in ) ; BufferedReader br = new BufferedReader ( r ) ; String si = br . readLine ( ) ; String [ ] sa = si . split ( " ▁ " ) ; int n = Integer . valueOf ( sa [ 0 ] ) ; int m = Integer . valueOf ( sa [ 1 ] ) ; StringBuffer str = new StringBuffer ( ) ; for ( int i = 0 ; i < n ; i ++ ) { String s = br . readLine ( ) ; for ( int j = 0 ; j < m ; j ++ ) { if ( s . charAt ( j ) == ' - ' ) { str . append ( " - " ) ; } else { if ( ( i + j ) % 2 == 0 ) { str . append ( " B " ) ; } else { str . append ( " W " ) ; } } } str . append ( " \n " ) ; } System . out . print ( str . toString ( ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))