def test2(): assert digit_at_index(13) == 1 assert digit_at_index2(13) == 1
def test11(): assert digit_at_index(-1) == -1 assert digit_at_index2(-1) == -1
def test12(): assert digit_at_index(-10) == -1 assert digit_at_index2(-10) == -1
def test9(): assert digit_at_index(1002) == 0 assert digit_at_index(1002) == 0
def test10(): assert digit_at_index(0) == 0 assert digit_at_index2(0) == 0
def test7(): assert digit_at_index(1000) == 3 assert digit_at_index(1000) == 3
def test8(): assert digit_at_index(1001) == 7 assert digit_at_index(1001) == 7
def test1(): assert digit_at_index(5) == 5 assert digit_at_index2(5) == 5
def test6(): assert digit_at_index(190) == 1 assert digit_at_index(190) == 1
def test5(): assert digit_at_index(189) == 9 assert digit_at_index(189) == 9
def test4(): assert digit_at_index(10) == 1 assert digit_at_index(10) == 1
def test3(): assert digit_at_index(19) == 4 assert digit_at_index2(19) == 4