public static void main ( String [ ] args ) throws IOException {
  FastScanner input = new FastScanner ( ) ;
  String s = input . next ( ) ;
  int ans = 0 ;
  Stack < Character > st = new Stack < > ( ) ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    if ( st . isEmpty ( ) ) st . add ( s . charAt ( i ) ) ;
    else {
      if ( st . peek ( ) == s . charAt ( i ) ) {
        st . add ( s . charAt ( i ) ) ;
      }
      else {
        ans ++ ;
        st . clear ( ) ;
        st . add ( s . charAt ( i ) ) ;
      }
    }
    if ( st . size ( ) == 5 ) {
      ans ++ ;
      st . clear ( ) ;
    }
  }
  if ( ! st . isEmpty ( ) ) ans ++ ;
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) throws IOException { FastScanner input = new FastScanner ( ) ; String s = input . next ( ) ; int ans = 0 ; Stack < Character > st = new Stack < > ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { if ( st . isEmpty ( ) ) st . add ( s . charAt ( i ) ) ; else { if ( st . peek ( ) == s . charAt ( i ) ) { st . add ( s . charAt ( i ) ) ; } else { ans ++ ; st . clear ( ) ; st . add ( s . charAt ( i ) ) ; } } if ( st . size ( ) == 5 ) { ans ++ ; st . clear ( ) ; } } if ( ! st . isEmpty ( ) ) ans ++ ; System . out . println ( ans ) ; }
(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)))) (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: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) 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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) alternative: (block (expression_statement (update_expression (identifier))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) (if_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) consequence: (expression_statement (update_expression (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))