static void printChar ( String str , int n ) {
  int [ ] freq = new int [ SIZE ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) freq [ str . charAt ( i ) - 'a' ] ++ ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( freq [ str . charAt ( i ) - 'a' ] % 2 == 0 ) {
      System . out . print ( str . charAt ( i ) ) ;
    }
  }
}

static void printChar ( String str , int n ) { int [ ] freq = new int [ SIZE ] ; for ( int i = 0 ; i < n ; i ++ ) freq [ str . charAt ( i ) - ' a ' ] ++ ; for ( int i = 0 ; i < n ; i ++ ) { if ( freq [ str . charAt ( i ) - ' a ' ] % 2 == 0 ) { System . out . print ( str . charAt ( i ) ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (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))))) (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: (expression_statement (update_expression (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_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: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))))))