  A simple shortcut to proving sharp weighted estimates for the Martingale
Transform and for the dyadic shift of order 1 (and so for the Hilbert
transform) is presented. It is a unified proof for these both transforms.
  Key words: Calder\on--Zygmund operators, $A_2$ weights, $A_1$ weights,
Carleson embedding theorem, Bellman function, dyadic shifts, nonhomogeneous
Harmonic Analysis.
