#import<ios>\x0d char*s,a[999],*b;main(){for(;b=s=gets(a);printf(*s+a-b+1?"failed at: %s\n":"yes\n",*s?s:"EOL"))for(;*s%4%3?*s%*--b<3:(*b++=*s);s++);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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