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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-255/
+"""
+
+Task 1: Odd Character
+
+Submitted by: [46]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given two strings, $s and $t. The string $t is generated using
+   the shuffled characters of the string $s with an additional character.
+
+   Write a script to find the additional character in the string $t..
+
+Example 1
+
+Input: $s = "Perl" $t = "Preel"
+Output: "e"
+
+Example 2
+
+Input: $s = "Weekly" $t = "Weeakly"
+Output: "a"
+
+Example 3
+
+Input: $s = "Box" $t = "Boxy"
+Output: "y"
+
+Task 2: Most Frequent Word
+"""
+### solution by pokgopun@gmail.com
+
+def oddChar(s,t: str):
+    for c in s:
+        t = t.replace(c,"",1)
+    return t
+
+import unittest
+
+class TestOddChar(unittest.TestCase):
+    def test(self):
+        for (s,t), otpt in {
+                ("Perl","Preel"): "e",
+                ("Weekly","Weeakly"): "a",
+                ("Box","Boxy"): "y",
+                }.items():
+            self.assertEqual(oddChar(s,t), otpt)
+
+unittest.main()