def solve!(input)
  input.sub!(/O*$/,'')
  t=2**$&.size-1
  oc,xc=%W(O X).map{|c|input.count(c)}
  t*4*2**oc+(
    xc==0 ? 0 : xc==1 ? 5+( oc==0 ? 0 : 5**oc ) : 1+4**(xc-1)*5**oc
  )
end
 
def test(n,input,expected)
  actual=solve!(input).to_s
  puts "#{n}:"+(actual==expected ? "ok" : "ng ( #{actual} against #{expected} )")
end
 
test(0, "X", "5")
test(1, "O", "4")
test(2, "XX", "5")
test(3, "OX", "10")
test(4, "XO", "9")
test(5, "XOO", "17")
test(6, "OXX", "21")
test(7, "OXO", "18")
test(8, "OOOX", "130")
test(9, "OXXO", "29")
test(10, "XXOX", "81")
test(11, "XOXXO", "89")
test(12, "OOOOX", "630")
test(13, "OXOOO", "66")
test(14, "OXOXOX", "2001")
test(15, "OXOXXO", "417")
test(16, "OXXOXX", "1601")
test(17, "XXXOXOO", "345")
test(18, "OOOOOXO", "3258")
test(19, "OXXOXXX", "6401")

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