from turtle import *

shape('turtle')
setup(250, 250)

def p(x, y):
    penup(), setpos(x, y)
    pendown()
    setheading(0)

def pr_tr(x, y, a, b, c = ""):
    p(x - a, y)
    color("black", c)
    begin_fill()
    fd(a), rt(90), fd(b)
    end_fill()

speed(0)
hideturtle()
x = int(input("x =  "))
y = int(input("y =  "))
a = int(input("a =  "))
b = int(input("b =  "))
pr_tr(x, y, a, b, "blue")
done()