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#!/usr/bin/python3
'''
Week 150:
https://theweeklychallenge.org/blog/perl-weekly-challenge-150
Task #1: Fibonacci Words
You are given two strings having same number of digits, $a and $b.
Write a script to generate Fibonacci Words by concatenation of the previous two strings. Finally print 51st digit of the first term having at least 51 digits.
'''
import unittest
def fibonacci_words(term1, term2, index):
while (len(term1 + term2) <= index):
term1, term2 = term2, term1 + term2
return (term1 + term2)[index-1]
#
#
# Unit test class
class TestTruncatablePrime(unittest.TestCase):
def test_example(self):
self.assertEqual(fibonacci_words('1234', '5678', 51), '7', 'Example')
unittest.main()
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