i;char*p,*q,s[9999];main(f){for(q-=read(0,q=s,p=s+7)*~(f&=*q);*p&&write(1,f||++i%2?p++:--q,1),f?*--q=*p++?:!puts(q+1):p<q;);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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