I use this in my classroom as an exit ticket. Each student has their own strip of letters and after the letter lesson, the student must clip a clothespin on the letter that was discussed. This reinforces letter recognition. You could also say, "clip the letter that makes the /m/ sound." The letter strips follow the order of the Wonders curriculum but can be used with any program. Just copy on sturdy paper and laminate for multiple uses!
Students could also use a dry erase marker to circle the letter.