prog.lua

local side_l = "left"
local side_r = "right"
local input = 0

term.clear()
term.setCursorPos(1,1)

while true do

local event = os.pullEvent(redstone)
input = redstone.getOutput(side_l)
if input then
redstone.setOutput(side_r, true)
else
redstone.setOutput(side_r, false)
end
end