Task: Question Answering
Input (English): Passage: One day I was thinking about my grandma who lives in Florida . I thought it would be nice to write her a letter . I sat down at the table and took out a pen and paper .  I told her about how I went to my friend 's birthday party and how I was looking forward to my vacation in August . I told her how my friends and I planned a trip to Washington D.C. for vacation . I signed the letter and folded it up .  I put a stamp on the letter and I walked down to the post office . I gave my letter to the postman and he put it in the mail to go out the next day . I bet Grandma will be excited to get my letter ! Question: When did they place the letter into the envelope? Option1: At the post office Option2: after signing and folding it
Output (English): after signing and folding it