import tkinter
from tkinter import Canvas

def f1():
    my_window = tkinter.Tk()
    my_canvas = Canvas(my_window, width = 450, height = 450)
    my_canvas.pack()
    
    my_canvas.create_oval(75, 75, 375, 375, outline = "black", fill = "red", width = 1)
    my_canvas.create_oval(125, 125, 325, 325, outline = "black", fill = "white", width = 1)
    my_canvas.create_oval(175, 175, 275, 275, outline = "black", fill = "red", width = 1)
    
def f2(matrix):
    result = []
    for i in range(len(matrix)):
        blank_row = []
        result.append(blank_row)
    for row in range(len(matrix)):
        for col in range(len(matrix[row])):
            result[row].append(len(matrix[row][col]))
    return result

def f3(list):
    if len(list) == 0:
        return 1
    else:
        return list[0] * f3(list[1:])

def f4(matrix):
    count = 0
    for row in range(len(matrix)):
        for col in range(len(matrix[row])):
            if type(matrix[row][col]) == int:
                count += 1
    return count