get_missing_letters("abcdefgpqrstuvwxyz") ➞ "hijklmno"

get_missing_letters("zyxwvutsrq") ➞ "abcdefghijklmnop"

get_missing_letters("abc") ➞ "defghijklmnopqrstuvwxyz"

self.assertEqual(get_missing_letters("abcdefgpqrstuvwxyz"), "hijklmno")
self.assertEqual(get_missing_letters("zyxwvutsrq"), "abcdefghijklmnop")
self.assertEqual(get_missing_letters("abc"), "defghijklmnopqrstuvwxyz")
self.assertEqual(get_missing_letters("abcdefghijklmnopqrstuvwxyz"), "")

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