box paint by nobsun

main=interact(0#)
_#""=""
0#('#':z)='#':1#z
0#(c:z)=c:0#z
1#('#':z)='#':2#z
1#(c:z)='.':3#z
2#('#':z)='#':2#z
2#(c:z)=c:0#z
3#('#':z)='#':0#z
3#(_:z)='.':3#z

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

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