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if #arg ~= 1 then
io.stderr:write('No args provided!')
os.exit(1)
end
local function is_esthetic_number(n)
assert(type(n) == 'number', 'n must be a number!')
local function uabs(a, b)
if a < b then return b - a else return a - b end
end
if n == 0 then return false end
local i = n % 10
n = n // 10
while n > 0 do
local j = n % 10
if uabs(i, j) ~= 1 then return false end
n = n // 10
i = j
end
return true
end
print(is_esthetic_number(tonumber(arg[1])))
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