Over print by kaki

(let(`print,string-length)`(port-fold(^(x r)`r((^s(dotimes(i,s)(if(eq?(~ s i)#\ )(set!(~ s i)(~ r i))))s)(format"~va",r x)))(#0=read-line)#0#))

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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