@app.route("/kostka")
def kostka():
    return str(randint(1,6))

@app.route("/kostka_v2/<variable>")
def kostka_v2(variable):
    return str(randint(1,int(variable)))

@app.route("/kostka_graficzna")
def kostka_graficzna():
    random = randint(1,6)

    if (random == 1):
        return '<img src="1.jpg" width=300 height=300>'
    if (random == 2):
        return '<img src="2.png" width=300 height=300>'
    if (random == 3):
        return '<img src="3.png" width=300 height=300>'
    if (random == 4):
        return '<img src="4.png" width=300 height=300>'
    if (random == 5):
        return '<img src="2.png" width=300 height=300>'
    if (random == 6):
        return '<img src="6.png" width=300 height=300>'