b,c;main(){for(;~(c=getchar());){b-15&&putchar(c);b|=c-'s'?c-'t'?c-'o'?c-'p'?0:8:4:2:1;b=b/c?!puts(""):b;}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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