- import std.typecons;
  import std.math;
  /*
  Given an array of positive integers x. return a sorted array of all 
-     elements that hasn't any even digit.
? ----

+ elements that hasn't any even digit.
- 
-     Note: Returned array should be sorted in increasing order.
? ----

+ Note: Returned array should be sorted in increasing order.
-     
-     For example:
? ----

+ For example:
-     >>> unique_digits([15L, 33L, 1422L, 1L])
? ----

+ >>> unique_digits([15L, 33L, 1422L, 1L])
-     [1L, 15L, 33L]
? ----

+ [1L, 15L, 33L]
-     >>> unique_digits([152L, 323L, 1422L, 10L])
? ----

+ >>> unique_digits([152L, 323L, 1422L, 10L])
+ []
-     []
-     
  */
  long[] unique_digits(long[] x)