Correct
丈二和尚，摸不着头脑
/ zhàng èr héshang, mōbuzháo tóunǎo /
Strokes
Definition
lit. like a three-meter high monk, you can't rub his head (idiom)/fig. at a total loss
Example
Definition
the monk is so tall that his top is out of reach—cannot make head or tail of sth; cannot fathom what sb means; be bewildered; be very much in the dark; feel at loss