#format python
import unittest

f = lambda n: n%10==0 and 10 or n%10
def compute_check_mod1110(str):
    t = 10
    for c in str:
        t = (2 * f(t + ord(c) - 48)) % 11
    return (11 - t) % 10

class CheckTest(unittest.TestCase):
    def testMod112(self):
        self.assertEquals(5, compute_check_mod1110('0794'))
        self.assertEquals(5, compute_check_mod1110('00200667308'))
        self.assertEquals(3, compute_check_mod1110('00200667309'))
        self.assertEquals(8, compute_check_mod1110('00200667310'))
        self.assertEquals(6, compute_check_mod1110('00200667311'))
        self.assertEquals(4, compute_check_mod1110('00200667312'))

if __name__=='__main__':
    unittest.main()