shared_letters("apple", "meaty") ➞ 2

shared_letters("fan", "forsook") ➞ 1

shared_letters("spout", "shout") ➞ 4

self.assertEqual(shared_letters("apple", "meaty"), 2)
self.assertEqual(shared_letters("fan", "forsook"), 1)
self.assertEqual(shared_letters("spout", "shout"), 4)
self.assertEqual(shared_letters("took", "taken"), 2)
self.assertEqual(shared_letters("mentor", "terminal"), 5)
self.assertEqual(shared_letters("class", "last"), 3)

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