Mixed ANOVA - How to interpret and write up results

Hello everyone! I'm struggling with my first-ever data analysis using SPSS. I have conducted a mixed ANOVA using a total number of objects kept before and after an emotional prime as repeated measures and the condition (the prime - positive vs negative) as the between subjects factor. I have no idea how to interpret the output, though... Can anyone help me? I've attached the output in PDF format.

Thank you!