Divide the Students into 2 teams.

Get them to sit in two lines and show the last Student at the back of each row a letter.

Scratch the letter on the back of the last student.

The student does the same to the next person up the row.

The person in front says it aloud.

If the letters agree, the team receives a point.

I recommend that you, at first, choose several letters and “draw” them in the air.