public static void main ( String [ ] args ) throws IOException {
  BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String top = r . readLine ( ) ;
  boolean cpp = false ;
  int score = 0 ;
  for ( int j = 0 ;
  j < top . length ( ) ;
  j ++ ) {
    if ( cpp ) {
      if ( top . charAt ( j ) == 'g' ) score ++ ;
      cpp = false ;
    }
    else {
      if ( top . charAt ( j ) == 'p' ) score -- ;
      cpp = true ;
    }
  }
  System . out . println ( score ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String top = r . readLine ( ) ; boolean cpp = false ; int score = 0 ; for ( int j = 0 ; j < top . length ( ) ; j ++ ) { if ( cpp ) { if ( top . charAt ( j ) == ' g ' ) score ++ ; cpp = false ; } else { if ( top . charAt ( j ) == ' p ' ) score -- ; cpp = true ; } } System . out . println ( score ) ; }
(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 (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (false))) (local_variable_declaration type: (integral_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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (identifier)) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (expression_statement (update_expression (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (false)))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (expression_statement (update_expression (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (true))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))