I forgot an obligatory act of the prayer, then I forgot to perform the prostration for forgetfulness after the prayer, so I prayed the Sunnah and then remembered. What is required of me?

Question:
I prayed the obligatory prayer from the five daily prayers and left out an obligatory act of the prayer out of forgetfulness. Then I remembered during the prayer and said, "I will perform the prostration for forgetfulness." I concluded the prayer with the taslim and did not perform the prostration, also out of forgetfulness. Then I immediately began the Sunnah prayer after the obligatory one. Do I perform the prostration for forgetfulness in the Sunnah prayer, or after it, with the intention of making up for the obligatory act I left out of the first prayer? Or what should I do? May Allah reward you with good and benefit us with your knowledge.

Answer:
If a person has the prostration for forgetfulness due to him, and then he stands up and enters into another prayer, he completes the prayer he entered and performs the prostration for forgetfulness after it. This is the most cautious course for him: he performs the prostration for forgetfulness when he has finished the prayer he entered. Yes.