tank

rednet.open("top")
function giveTankAmount()
   local s,m = rednet.receive()
   if s == 4 then
      local tank = peripheral.wrap("left")
      local x = tank.getTankInfo()
      local x = x[1]
      local x = x.contents.amount
      rednet.send(s,x)
      return s
   else
      rednet.send(s, "denied")
   end
end
local a = true
repeat
   local b = giveTankAmount()
   print("Request from #"..b)
until a == false