public static void main ( String [ ] $ ) {
  Scanner sc = new Scanner ( in ) ;
  int n = sc . nextInt ( ) ;
  char [ ] r = sc . next ( ) . toCharArray ( ) ;
  double sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( r [ i ] != 'F' ) sum += ( 69 - ( int ) r [ i ] ) ;
  }
  out . println ( sum / n ) ;
}

public static void main ( String [ ] $ ) { Scanner sc = new Scanner ( in ) ; int n = sc . nextInt ( ) ; char [ ] r = sc . next ( ) . toCharArray ( ) ; double sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( r [ i ] != ' F ' ) sum += ( 69 - ( int ) r [ i ] ) ; } out . println ( sum / n ) ; }
(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 (identifier))))) (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: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_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 (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (decimal_integer_literal) right: (cast_expression type: (integral_type) value: (array_access array: (identifier) index: (identifier)))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)))))))