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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-245/
+"""
+
+Task 2: Largest of Three
+
+Submitted by: [46]Mohammad S Anwar
+     __________________________________________________________________
+
+   You are given an array of integers >= 0.
+
+   Write a script to return the largest number formed by concatenating
+   some of the given integers in any order which is also multiple of 3.
+   Return -1 if none found.
+
+Example 1
+
+Input: @digits = (8, 1, 9)
+Output: 981
+
+981 % 3 == 0
+
+Example 2
+
+Input: @digits = (8, 6, 7, 1, 0)
+Output: 8760
+
+Example 3
+
+Input: @digits = (1)
+Output: -1
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 3rd December
+   2023.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+"""
+### solution by pokgopun@gmail.com
+
+from itertools import permutations
+
+def lot(tup: tuple):
+    for n in range(len(tup),0,-1):
+        for x in permutations(
+                sorted(tup,reverse=True), n
+                ):
+            y = int(
+                    "".join( str(e) for e in x )
+                    )
+            if y % 3 == 0: return y
+    return -1
+
+for inpt, otpt in {
+        (8, 1, 9): 981,
+        (8, 6, 7, 1, 0): 8760,
+        (1,): -1,
+        }.items():
+    print(otpt==lot(inpt))