trash low school mathematics or physics needed, no programming. Find a formula only that you can't know by your own.

trash broken invavid kata

Testing for '84199869583086393_-RZQDc_G_DBUlxQP_Apzk_oLLcpclD.96.ZGBzqOf1K457B5355d36888h24P'
It should work for random inputs too: 'RZQDc_G_DBUlxQP_Apzk_oLLcpclD_.96_' should equal '-RZQDc_G_DBUlxQP_Apzk_oLLcpclD.96'
(damn markdown not shows as it is - '-__filename.extension')

HOW?!
"It should work for random inputs too: 'u.5t8' should equal '-_u.5t8' "

Once i random passed, but not submitted...
And no more luck.
Tried hard to correct to this: "(-|__)?([a-zA-Z][a-zA-Z_-]*.[a-zA-Z-\d]+)?\w?"

until:
Server Execution Error:
Too Many Requests
Request Error:
Request failed with status code 429
Please fix the issue and try again.

Realy?!
It should work for random inputs too: '__qIrHfXYItuGxZAZ-gglMrUOR.5A7' should equal '_qIrHfXYItuGxZAZ-gglMrUOR.5A7'

I'm, sorry, what does this mean?
Testing for '000893452___gghjjX.98W.n7876T4f35089_6RF92855'
It should work for random inputs too: 'gghjjX.98W' should equal '__gghjjX.98W'

Why sometimes '-' and '' and double-' _' alowed at start, and sometimes not?!

Some random tests may sometimes fail your solution. But sometimes almost perfect code will pass the random tests ^^

Yeah, i forgot to operate the 2-nd remark: "if the given string is "" you will return "" ".
It's python.
But the Sample Tests realy shown as broken:
test.assert_equals(stat("01|15|59, 1|47|16, 01|17|20, 1,|32|34 2|17|17"),
"Range: 01|01|18 Average: 01|38|05 Median: 01|32|34")
And when i print(strg.split(", ")) - there printed ["01|15|59", "1|47|16", "01|17|20", "1"(!!), "|32|34"(!!), "2|17|17"]

After all, addind output "" for "" input - make the the bug disapeer ^^

Hah, read this after solved. I have the longest code in Solutions.
God damn task took me all the day.
Well, only 35% of people passed the task on Python.