#!/usr/bin/env julia

infile = size(ARGS, 1) > 0 ? ARGS[1] : "day2input.txt"
println("infile = ", infile)

a_move_value = Dict("A"=>1, "B"=>2, "C"=>3)
function score(opponent, self)
  oval = a_move_value[opponent]

  if self == "X"
    # need to lose
    sval = 1 + mod(oval - 2, 3)
    return sval
  elseif self == "Y"
    # need to tie
    sval = oval
    return 3 + sval
  else
    # need to win
    sval = 1 + mod(oval, 3)
    return 6 + sval
  end
end

io = open(infile, "r")
total = 0
for line in eachline(io)
  global total
  o, s = split(line)
  total += score(o, s)
end

println(total)