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#! /usr/bin/python3
import unittest
def fnr(i):
s=dict()
ls=list()
o=list()
for c in list(i):
ls.append(c)
s.setdefault(c,0)
s[c] += 1
ls=[x for x in ls if s[x]<2]
if len(ls)>0:
o.append(ls[len(ls)-1])
else:
o.append('#')
return ''.join(o)
class TestMajority(unittest.TestCase):
def test_ex1(self):
self.assertEqual(fnr('ababc'),'abb#c','example 1')
def test_ex2(self):
self.assertEqual(fnr('xyzzyx'),'xyzyx#','example 2')
unittest.main()
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