static int distinct_year ( String str ) {
  String str2 = "" ;
  Set < String > uniqueDates = new HashSet < > ( ) ;
  for ( int i = 0 ;
  i < str . length ( ) ;
  i ++ ) {
    if ( Character . isDigit ( str . charAt ( i ) ) ) {
      str2 += ( str . charAt ( i ) ) ;
    }
    if ( str . charAt ( i ) == '-' ) {
      str2 = "" ;
    }
    if ( str2 . length ( ) == 4 ) {
      uniqueDates . add ( str2 ) ;
      str2 = "" ;
    }
  }
  return uniqueDates . size ( ) ;
}

static int distinct_year ( String str ) { String str2 = " " ; Set < String > uniqueDates = new HashSet < > ( ) ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { if ( Character . isDigit ( str . charAt ( i ) ) ) { str2 += ( str . charAt ( i ) ) ; } if ( str . charAt ( i ) == ' - ' ) { str2 = " " ; } if ( str2 . length ( ) == 4 ) { uniqueDates . add ( str2 ) ; str2 = " " ; } } return uniqueDates . size ( ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (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 (identifier))) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (string_literal))))) (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (string_literal))))))) (return_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))