from turtle import fd, lt, rt, ht, st, fillcolor, begin_fill, end_fill

def draw_star(length, colour):
    if colour == "Y":
        fillcolor('yellow')
    elif colour == "R":
        fillcolor('red')
    else:
        fillcolor('blue')

    begin_fill()
    for x in range(5):
        fd(length)
        lt(72)
        fd(length)
        rt (144)
    end_fill()

length = int(input("How long should each side of the star be?" ))
colour = input("What colour is your star? Enter Y for yellow, R for red or B for blue: ")

st()
draw_star(length, colour)

ht()