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4 bytes saved thanks to @EriktheOutgolfer
{(1-⍨w z-⍨⊃⍸⍺=s⍨⊃⍸⎕=s)↑(w z←∊⊃⌽⍸⍵=sw←∊⊃⌽⍸⎕=s)↑s←↑⎕}
Try it online!Try it online!
{(1-⍨w z-⍨⊃⍸⍺=s)↑(w z←∊⊃⌽⍸⍵=s)↑s←↑⎕}
Try it online!
(1-⍨w-⍨⊃⍸⎕=s)↑(w←∊⊃⌽⍸⎕=s)↑s←↑⎕
