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+#!/usr/bin/env python3
+
+import re
+from operator import itemgetter
+
+
+def sort_string(string):
+ """ Given a shuffle string, return the sorted string. A string is shuffled
+ by appending word position to each word.
+
+ >>> sort_string("and2 Raku3 cousins5 Perl1 are4")
+ 'Perl and Raku are cousins'
+ >>> sort_string("guest6 Python1 most4 the3 popular5 is2 language7")
+ 'Python is the most popular guest language'
+ >>> sort_string("Challenge3 The1 Weekly2")
+ 'The Weekly Challenge'
+ """
+ p = re.compile('^(\w+)(\d+)$')
+ words_numbers = (p.search(word).groups() for word in string.split(" "))
+ words_numbers_sorted = sorted(((w[0], int(w[1])) for w in words_numbers), key=itemgetter(1))
+ return " ".join(word[0] for word in words_numbers_sorted)
+
+
+if __name__ == "__main__":
+ import doctest
+
+ doctest.testmod(verbose=True)