indicator

Hello everyone, I want to write an indicator. I want to show A on top of red candles and B on top of green candles. Then, if the combination of ABAA occurs, I want a red line to appear on that combination.
I print the characters A and B on the candles like this:
//@version=4
study('Example', overlay=true)
B = close >= open
plotchar(B, char='B')
A = close <= open
plotchar(A, char='A')

but I don't know how the red line code will be on ABAA combinations. Please help me!!!

//@version=4
study('Example', overlay=true)
B = close >= open
plotchar(B, char='B', location = location.abovebar)
A = close <= open
plotchar(A, char='A', location = location.belowbar)

// detect ABAA
ABAA_cond = A and A[1] and B[2] and A[3]

plot(ABAA_cond and not ABAA_cond[1] ? close : na, color = color.red, title = "ABAA", style=plot.style_linebr, linewidth=2)

Dave Dave (@davedave):

thank you