main(){int m[999],c,b=0,n,i=0;while((c=getchar())>0){b?putchar(c==10?10:c-32^m[i-b]-32?79:32):0,m[i++]=c,n=c-10?0:(n?b=i,1:1);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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