How can I extrude edges inwards so the offset distance is same for all edges?

How can I extrude edges inwards and keep same distance for all extruded edges? When I try to extrude (see pic 1) and press “s” all extruded edges have different offset from original (see pic 2) and I need extruded edges to have same offset distance from original. How can I do so?

from left to right:

  1. fill shape (f)
  2. inset face (i)
    3 delete inner face (x)
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Thanks! You saved my day! That did the job

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