Shift list problem

Hello, I’m working on this bench/ screen and I’ve got a problem with shifting lists. I’d like all the faces on the left hand side (when looking from the outside towards the center) to be blue and the ones on the right to be pink. It works only for half of the circle - then the colors swap. I’ve tried shifting and sorting lists but I can’t make it work.

shift (13.1 KB)

Many thanks

shift (16.7 KB)

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Perfect. Thank you so much. I’ve got loads to learn.