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#!python
import sys
def is_stepping(number: str):
number = str(number)
seq = str(number)[0]
for i in number[1:]:
if abs(int(i)-int(seq)) != 1:
return 0
seq = i
return 1
assert len(sys.argv) == 3
for i in range(int(sys.argv[1]), int(sys.argv[2])+1):
if is_stepping(i):
print(i)
# TESTS
assert is_stepping(100) == 0
assert is_stepping(123) == 1
assert is_stepping(321) == 1
assert is_stepping(989) == 1
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