Lua Random Number Guesser Game - Optimised Edition

a = io.read("*n")
b = function(x)
    local c = math.random(1,10)
    return x[c]
    end
if (a > c):
    print("Lower!")
    end
if (c > a):
    print("Higher!")
    end
if else:
    print("You guessed the number right!")
    end
--to see the original script - see here: https://pastebin.com/M06fbgqD