char const mbd[]=
"000\n"
"123\n"
"114\n"
"514\n"
"999\n"
"099\n"
"001\n"
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;

main(){
	unsigned long a=0,b;
	while(write(1,mbd+a,4),read(0,&b,7),b&8){
		a+=4;
	}
}