public static void main ( String args [ ] ) {
  Scanner in = new Scanner ( System . in ) ;
  while ( in . hasNext ( ) ) {
    int n = in . nextInt ( ) ;
    int code = ( n * n + 1 ) / 2 ;
    System . out . println ( code ) ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      StringBuffer stringBuffer = new StringBuffer ( ) ;
      for ( int j = 0 ;
      j < n ;
      j ++ ) {
        if ( ( i + j + 2 ) % 2 == 0 ) stringBuffer . append ( 'C' ) ;
        else stringBuffer . append ( '.' ) ;
      }
      System . out . println ( stringBuffer ) ;
    }
  }
}

public static void main ( String args [ ] ) { Scanner in = new Scanner ( System . in ) ; while ( in . hasNext ( ) ) { int n = in . nextInt ( ) ; int code = ( n * n + 1 ) / 2 ; System . out . println ( code ) ; for ( int i = 0 ; i < n ; i ++ ) { StringBuffer stringBuffer = new StringBuffer ( ) ; for ( int j = 0 ; j < n ; j ++ ) { if ( ( i + j + 2 ) % 2 == 0 ) stringBuffer . append ( ' C ' ) ; else stringBuffer . append ( ' . ' ) ; } System . out . println ( stringBuffer ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) 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)))))) (while_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (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: (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 (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal)))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))))