public static void main ( String [ ] $ ) {
  char [ ] c = s . next ( ) . toCharArray ( ) ;
  int n = c . length ;
  int [ ] rem = new int [ n ] ;
  int res = 0 , rem_ = 0 ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    if ( c [ i ] == 'g' ) {
      ++ rem_ ;
    }
    else {
      if ( rem_ > 0 ) {
        -- rem_ ;
      }
      else {
        ++ res ;
      }
    }
    rem [ i ] = rem_ ;
  }
  System . out . println ( res + rem [ n - 1 ] / 2 ) ;
}

public static void main ( String [ ] $ ) { char [ ] c = s . next ( ) . toCharArray ( ) ; int n = c . length ; int [ ] rem = new int [ n ] ; int res = 0 , rem_ = 0 ; for ( int i = 0 ; i < n ; ++ i ) { if ( c [ i ] == ' g ' ) { ++ rem_ ; } else { if ( rem_ > 0 ) { -- rem_ ; } else { ++ res ; } } rem [ i ] = rem_ ; } System . out . println ( res + rem [ n - 1 ] / 2 ) ; }
(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: (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: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) 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: (block (expression_statement (update_expression (identifier)))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (update_expression (identifier))))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal))))))))