Delete features named something other than a number in textbox

I am trying to figure out how to loop a delete feature. I have a model template that I have 8 pre-built cut revolves. They are named "1 Step", "2 Step","3 Step","4 Step","5 Step","6 Step","7 Step" & "8 Step". I am trying to create a text box with the "instX" value be the the feature I want to KEEP. Loop though and delete the other 7 features and the absorbed sketches. I input 3 in my step count box it deletes 1,2,4,5,6,7 & 8 Step with the absorbed feature.

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