一道英语迷.Take away my first letter,take away my second letter,t

Take away my first letter,take away my second letter,take away all my letters,and I remain the same． What am 拿走我的第一个字母,第二个字母,拿走我所有的字母,我还是我,请问我是谁?
答案：A postman.邮递员.
letter 既可以解释字母又可以解释成信