import tkinter as tk
import random

def cerveny_ctverec(canvas):
    x = random.randint(0, 390)
    y = random.randint(0, 390)

    canvas.create_rectangle(x, y, x + 10, y + 10, fill="red")

def modry_ctverec(canvas):
    x = random.randint(0, 390)
    y = random.randint(0, 390)

    canvas.create_rectangle(x, y, x + 10, y + 10, fill="blue")

def main():
    root = tk.Tk()
    root.title("Opakovaný čtverec")

    canvas = tk.Canvas(root, width=400, height=400, bg="white")
    canvas.pack()

    for _ in range(2000):
        cerveny_ctverec(canvas)

    for _ in range(2000):
        modry_ctverec(canvas)

    root.mainloop()

if __name__ == "__main__":
    main()