+ import std.math;
  import std.typecons;
- import std.math;
  /*
  You are given two intervals,
-     where each interval is a pair of integers. For example, interval = (start, end) = (1, 2).
? ----

+ where each interval is a pair of integers. For example, interval = (start, end) = (1, 2).
-     The given intervals are closed which means that the interval (start, end)
? ----

+ The given intervals are closed which means that the interval (start, end)
-     includes both start and end.
? ----

+ includes both start and end.
-     For each given interval, it is assumed that its start is less or equal its end.
? ----

+ For each given interval, it is assumed that its start is less or equal its end.
-     Your task is to determine whether the length of intersection of these two 
? ----

+ Your task is to determine whether the length of intersection of these two 
-     intervals is a prime number.
? ----

+ intervals is a prime number.
-     Example, the intersection of the intervals (1, 3), (2, 4) is (2, 3)
? ----

+ Example, the intersection of the intervals (1, 3), (2, 4) is (2, 3)
-     which its length is 1, which not a prime number.
? ----

+ which its length is 1, which not a prime number.
-     If the length of the intersection is a prime number, return "YES",
? ----

+ If the length of the intersection is a prime number, return "YES",
-     otherwise, return "NO".
? ----

+ otherwise, return "NO".
-     If the two intervals don't intersect, return "NO".
? ----

+ If the two intervals don't intersect, return "NO".
- 
- 
-     [input/output] samples:
? ----

+ [input/output] samples:
-     >>> intersection(tuple(1L, 2L), tuple(2L, 3L))
? ----

+ >>> intersection(tuple(1L, 2L), tuple(2L, 3L))
-     "NO"
+ "NO"
-     >>> intersection(tuple(-1L, 1L), tuple(0L, 4L))
? ----

+ >>> intersection(tuple(-1L, 1L), tuple(0L, 4L))
-     "NO"
+ "NO"
-     >>> intersection(tuple(-3L, -1L), tuple(-5L, 5L))
? ----

+ >>> intersection(tuple(-3L, -1L), tuple(-5L, 5L))
+ "YES"
-     "YES"
-     
  */
  string intersection(Tuple!(long, long) interval1, Tuple!(long, long) interval2)