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diff --git a/challenge-268/steven-wilson/python/ch-1.py b/challenge-268/steven-wilson/python/ch-1.py
new file mode 100644
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+++ b/challenge-268/steven-wilson/python/ch-1.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+
+def magic_number(x, y):
+    ''' Given two arrays of integers of same size, find the magic number that
+    when added to each elements of one of the array gives the second array.
+    Elements order is not important.
+    >>> magic_number([3, 7, 5], [9, 5, 7])
+    2
+    >>> magic_number([1, 2, 1], [5, 4, 4])
+    3
+    >>> magic_number([2], [5])
+    3
+    '''
+    if not isinstance(x, list) or not isinstance(y, list):
+        raise ValueError("Inputs 'x' and 'y' must be lists.")
+
+    if len(x) != len(y):
+        raise ValueError("Inputs 'x' and 'y' must have the same length.")
+
+    if not all(isinstance(num, int) for num in x) or not all(isinstance(num, int) for num in y):
+        raise ValueError("All elements in 'x' and 'y' must be integers.")
+
+    return abs(max(x) - max(y))
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)