The post office has thousands of letters.A thief(小偷) is afra

The post office has thousands of letters.A thief(小偷) is afra the post office has thousands of letters.A thief is afraid o The post pffice has thousands of letters.A thief is afraid f The post office has thousands of letters.A theif is afraid f The post oficehas thousands of letters.A thief is afraid of Which four letters is the thief afraid of?小偷害怕哪四個英文字母? 1.a thief is afraid of the four letters''oicu''.do youk know A thief is afraid of the four letters"OICU'.Do you know why A thief is afraid of the four letters"OICU".Dou you know why A thief is afraid of the four letters"OICU".Do you know why? What has thousands of letters in it? which has thousands of letters in it?