input.onButtonPressed(Button.A, function () {
    basic.clearScreen()
    szam += -1
    basic.showNumber(0)
})
input.onButtonPressed(Button.B, function () {
    basic.clearScreen()
    szam += 1
    basic.showNumber(0)
})
let szam = 0
basic.showLeds(`
    . . . . .
    . # . # .
    # # . # #
    . # . # .
    . . . . .
    `)