I was sitting on the crapper and it just occured to me out of the blue, I wasn't even thinking about it, just boom ofcourse.
"abdc" sorted is "abcd" so it is in the ascii_letters "ABCDefg....." but "abed" sorted "abde" is not in ascii_letters "ABcDEfg...." because there is "c" in between.
It works for double letters as well.
And the statement is boolean so True of False.

Gotta remember this.

Thank you anyway for the explanation I was couple minutes too late :).