digits = '1234567890'
loop  line = input   :f(end)
      line fence arb span(digits) . d1 (span(' ') | '') 'milk' arb . p2 break(')') ')' (span(' ') | '') span(digits) . d2
      g = 0
      line fence arb span(digits) . g (span(' ') | '') 'milk' arb . p2 break(')') ')' (span(' ') | '') span(digits) . d2 :f(sk)
sk      output = g ' ' d2 :(loop)
end