Circle lenght/square calculator

copyright=[[
Circle  radius,lenght,square  calculator  by  Ruslan  Isaev
]]
print("")
print(copyright)
print("")
print("Type  circle  radius")
radius=io.read()
print("What  do  you  want  to  do:S,L")
op=io.read()
if(op=='L') then
  print("LENGHT:  ")
  print(2*3.14*radius)
end
if(op=='S') then
  print("SQUARE:  ")
  print(3.14*radius^2)
end