How to get the integration reaction force of the indenter in Abaqus/standard

Hi, everyone,
Now I have a problem with indentation simulation. With Abaqus/standard, I set the indenter as deformable solid, and control the indentation depth of the indenter to monitor the reaction force of the indenter. But it seems the integration operator only can be used under abaqus/explicit, how can I get the integration reaction force of the indenter under Abaqus/standard.
Thank you, any help will be appreciated.