import turtle

print ("Menu - Select a Shape")
print ("S: square")
print ("C: circle")
print ("R: rectangle")
menu = input ("")
menu = menu.lower()

draw = turtle.Turtle()
if menu == "s":
    draw.forward(100)
    draw.left(90)
    draw.forward(100)
    draw.left(90)
    draw.forward(100)
    draw.left(90)
    draw.forward(100)
elif menu == "c":
    draw.circle(100)