-- your code goes here
local function battle() -- All of this is 100% unfinished, by the way
  n = math.random(10) + 1 -- Everybody's HP, enemy HP randomly generated number from 10 to 100
  enemyhp = 10*n
  herohp = 100
  io.write("Your HP: ")
  io.write(herohp)
  io.write(" ")
  io.flush()
  io.write("Enemy HP: ")
  io.write(enemyhp)
  io.write(" ")
  io.flush()
  if enemyhp <= 0 then
    print("You won!")
  end
end
local function attack()  -- Attacking the enemy or running away
  print("|Attack|Flee|")
  input = io.read()
  if input == "attack" then -- This is where my error is
    attackdamage = math.random(51)
    if attackdamage == 51 then
      print("Critical Hit!")
      enemyhp = enemyhp - 100
    else
      enemyhp = enemyhp - attackdamage
      print("Enemy took ")
      io.write(attackdamage)
      io.write(" damage!")
    end
  elseif input == "flee" then
    print("You ran away!")
  end
end