ComputerCraft Missile Code

term.setBackgroundColor(colors.gray)
term.setTextColor(colors.green)
sSide = "back"
password = "1234"
yes = "yes"
term.clear()
term.setCursorPos(1,1)
print("SILO A:")
print("TYPE: CHEMICAL")
print("SUBJECT: VILLAGE")
sleep(1)
write("loading")
textutils.slowWrite("...", 1.5)
sleep(1)
term.clear()
term.setCursorPos(1,2)
print("ENTER AUTHENTIFICATION CODE TO")
print("CONTINUE WITH LAUNCH SEQUENCE")
term.setCursorPos(2,5)
write("CODE:")
input1 = read("*")
term.setTextColor(colors.red)
term.setCursorPos(21,7)
if input1 == password then
term.setTextColor(colors.blue)
print("ACCEPTED")
term.setCursorPos(21,8)
term.setTextColor(colors.green)
write("loading")
textutils.slowWrite("...", 1.5)
term.clear()
term.setCursorPos(2,2)
print("ARE YOU SURE THAT YOU WANT TO LAUNCH?")
term.setCursorPos(5,18)
term.setTextColor(colors.red)
print("THIS PROCESS IS IRREVERSIBLE")
term.setCursorPos(3,3)
term.setTextColor(colors.green)
input2 = read()
if input2 == yes then
term.clear()
term.setCursorPos(1,2)
print("Opening Silo...")
redstone.setBundledOutput(sSide, colors.white)
sleep(1)
redstone.setBundledOutput(sSide, colors.lightGray)
sleep(1)
redstone.setBundledOutput(sSide, colors.lightBlue)
sleep(5)
redstone.setBundledOutput(sSide, 0)
print("Calculating Missile Path...")
sleep(1.5)
print("Locating Target...")
sleep(1.5)
print("Running Aerodynamic Simulation...")
sleep(1.5)
write("Firing in")
textutils.slowWrite(" 3 2 1 ", 2)
print()
term.setTextColor(colors.red)
print("IGNTITION")
redstone.setBundledOutput(sSide, colors.green)
sleep(5)
term.clear()
term.setCursorPos(1,2)
term.setTextColor(colors.green)
print("Closing Silo...")
redstone.setBundledOutput(sSide, colors.blue)
sleep(5)
redstone.setBundledOutput(sSide, colors.black)
sleep(1)
redstone.setBundledOutput(sSide, colors.gray)
sleep(1)
redstone.setBundledOutput(sSide, 0)
term.setCursorPos(13,8)
term.setTextColor(colors.red)
print("AutoShutdown in 5 seconds")
sleep(5)
os.shutdown()
else
term.setTextColor(colors.red)
term.setCursorPos(4,8)
print("Launch Cancelled. AutoShutdown in 5 seconds")
sleep(5)
os.shutdown()
end
else
term.setCursorPos(20,7)
term.setTextColor(colors.red)
print("DENIED")
term.setCursorPos(13,8)
print("AutoShutdown in 5 seconds")
redstone.setBundledOutput(sSide, colors.lime)
sleep(5)
os.shutdown()
end