public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  StringBuilder SB = new StringBuilder ( ) ;
  int n = in . nextInt ( ) ;
  if ( n % 2 == 0 ) {
    int k = n / 2 ;
    System . out . println ( ( k ) * n ) ;
    for ( int i = 1 ;
    i <= k ;
    i ++ ) {
      for ( int j = 1 ;
      j <= k ;
      j ++ ) {
        SB . append ( "C." ) ;
      }
      SB . append ( "\r\n" ) ;
      for ( int j = 1 ;
      j <= k ;
      j ++ ) {
        SB . append ( ".C" ) ;
      }
      SB . append ( "\r\n" ) ;
    }
  }
  else {
    int k = n / 2 ;
    System . out . println ( ( k + 1 ) * ( ( k ) + 1 ) + ( k ) * ( k ) ) ;
    for ( int i = 1 ;
    i <= k ;
    i ++ ) {
      for ( int j = 1 ;
      j <= k ;
      j ++ ) {
        SB . append ( "C." ) ;
      }
      SB . append ( "C" ) ;
      SB . append ( "\r\n" ) ;
      for ( int j = 1 ;
      j <= k ;
      j ++ ) {
        SB . append ( ".C" ) ;
      }
      SB . append ( "." ) ;
      SB . append ( "\r\n" ) ;
    }
    for ( int j = 1 ;
    j <= k ;
    j ++ ) {
      SB . append ( "C." ) ;
    }
    SB . append ( "C" ) ;
    SB . append ( "\r\n" ) ;
  }
  System . out . println ( SB ) ;
}

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