Extra y ticks labeling for second y-axis

Question

How do I use extra y tick (or some suitable alternative) to create a second labeled y-axis with the exact same tick mark positioning as the first labeled y-axis, but instead of the numbers 0, 0.2, 0.4, 0.6, 0.8, 1, use A, B, C, D, E?  I have already placed the second y-axis tick mark positions with ytick pos=both.

documentclass{article}
usepackage{pgfplots}
begin{document}
begin{tikzpicture}
begin{axis}[ytick pos=both]
addplot {rnd};
end{axis}
end{tikzpicture}
end{document}

user11232 · Accepted Answer

You can use another axis environment.

documentclass{article}
usepackage{pgfplots}
pgfplotsset{compat=1.12}
begin{document}
begin{tikzpicture}
begin{axis}[axis y line*=left,ymin=-0.1,ymax=1.1]
addplot {rnd};
end{axis}
begin{axis}[hide x axis,axis y line*=right,ymin=-0.1,ymax=1.1,
       ytick=empty,
       extra y ticks={0,0.2,...,1},
       extra y tick labels={A,B,...,F}
       ]
  addplot[draw=none] {x};   % dummy plot
end{axis}
end{tikzpicture}
end{document}

Use same values for ymin and ymax for both the axis and make use of extra yticks and extra y tick labels to customise the entries.

Nob Som · Answer

documentclass{article}
usepackage{pgfplots}
pgfplotsset{compat=1.12}
begin{document}
begin{tikzpicture}
begin{axis}[axis y line*=left,ymin=-0.1,ymax=1.1]
addplot {rnd};
end{axis}
begin{axis}[hide x axis,axis y line*=right,ymin=-0.1,ymax=1.1,
       ytick=empty,
       extra y ticks={0,0.2,...,1},
       extra y tick labels={A,B,...,F}
       ]
  addplot[draw=none] {x};   % dummy plot
end{axis}
end{tikzpicture}
end{document}

Extra y ticks labeling for second y-axis

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