lol I didin't know this method islnum exists

I myself did not understand how it happened to me.
I still can't figure out how it works.
I would be very grateful if someone would explain to me in more detail
how it worked so that Fn =536_870_911 ==> suddenly F0=29

Of course, I can be very mistaken.
But at the moment I strongly doubt that for the number 536_870_911, the answer will be 29.
Because by checking the reverse method, even for 1, I achieve the number 536_870_912!!!
And how many times did I multiply 29 or 28 by 2, for example (28*2** i for i in range(50)),
then I'm not even close to the given number (536_870_910)
... I don't know whether to put a spoiler here or not

And so that it is impossible to specify at least how many days it is necessary to achieve this result

you can use a letter the number of times it is in the second string.

. . . Each letter can be used only once and in one string only.

and then what about this one? --> in tests: . . .strings_construction("zzz","zzzzzzzzzzz"),3

I have almost the same solution, but yours is better

Нормальная ката, для 8 kyu самое оно, то что надо

The description of this task is not entirely clear. For example, I did not understand anything at all, what is required of me to do??????

I have almost the same thing. But I suffered with this decision for a very long time

But is it a simple loop? I've done it a thousand times and it's always been fine. And then suddenly it started like this

An amazing, magnificent, grandiose decision. I 'm in awe !!!