day8-2.prdc

l5Ú150/™ gm',Á25/Pe .. 19 bytes*

.. this actually produces output you need to read to get the answer but
.. I think it's the best we can realistically do

{
l    .. read line
5Ú   .. deep mod 5; we simply want ord(2) to get mapped to 0 and the others not
150/ .. chunks of size 150
™    .. transpose, so every row is the list of pixels in the same location
 gm  .. map (_m) every transposed row by getting the first (_g) truthy (space) pixel
',Á  .. vectorizing add by the character ',' mapping 3 to '/' and 4 to '0'
     .. if you replace ',' with the nonprintable character with value 29 or 31,
     .. things should be more readable, but this works in a pinch
25/  .. chunks of 25
Pe   .. print each
};