//@version=4
study("My Script", overlay=true)

sma1 = sma(close, 8)
sma2 = sma(close, 13)
plot(sma1, color=color.green)
plot(sma2, color=color.red)
cross_bull = crossover(sma1, sma2)


loBar = bar_index + lowestbars(4)

if cross_bull
    label.new(x=loBar, y=high, text="L", yloc=yloc.abovebar, color=color.red, style=label.style_label_down, textcolor=color.white, size=size.small, textalign=text.align_center)