unsupported format !?

[Lion]

hi!
one of my Characters's short value is "a" (you know:

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a "hi"

instade of

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"adam" "hi"

...)
and everything is fine and dandy, but then line number 15 of my script get this!

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ValueError: unsupported format character 'a' (0x61) at index 46

while i would understand it if i couldn't use "a" at all, i do infact use it!
(line 14) a "..."
(line 15) a "Its might be a prank... no, actually its 100% a prank!"
and line 14 is just fine, but once the game get to line 15, crush! O.O

i seriusly dont get what the problem here!
obviusly im doing something wrong here, but i just dont get where im wrong!?

thenks for the helpers

edit:
lol i figured it out, the unsupported 'a' wasn't the character's 'a', it was the 'a' after "100%" and before "prank"
a "Its might be a prank... no, actually its 100% A prank!"
i guess it's something to do with "%(-)s", but then, how do i use the sign "%" without cuseing errors?

[JinzouTamashii]

Ren'Py doesn't like that percentage without a backslash in front of it, if I remember right. In my old game, I just flat out said "percent" instead. It was easier.

[Alex]

Try "...\%..."

[Aleema]

%% <- Double makes it work.

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a "Its might be a prank... no, actually its 100%% A prank!"

[Lion]

thenks, it worked!
%% worked for me