image = ARGF.read
image.gsub!(/^(\.+)$/m, "\\1\n\\1")
image = image.split("\n").map(&:chars).transpose.map(&:join).join("\n")
image.gsub!(/^(\.+)$/m, "\\1\n\\1")
image = image.split("\n").map(&:chars)

galaxies = image.flat_map.with_index {|row, y|
  row.filter_map.with_index {|elem, x| elem == ?# ? [y,x] : nil }
}

p galaxies.combination(2).sum {|a, b|
  a.zip(b).sum { (_1 - _2).abs }
}