Encoder decoder by 51b

i=6;char s[9999];main(j){for(j=read(0,s,s);*s%2?j>6:i<j;)putchar(s[~*s%2?--j-++i&&putchar(s[i]),j:++i>j?j-=2:i++]);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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