source: https://habr(dot)com/post/113339/

>+>+>+>+>++<[>[<+++>-
 >>>>>
 >+>+>+>+>++<[>[<+++>-
   >>>>>
   >+>+>+>+>++<[>[<+++>-
     >>>>>
     >+>+>+>+>++<[>[<+++>-
       >>>>>
       +++[->+++++<]>[-]<
       <<<<<
     ]<<]>[-]
     <<<<<
   ]<<]>[-]
   <<<<<
 ]<<]>[-]
 <<<<<
]<<]>.