Which four letters is the thief afraid of?小偷害怕哪四個英文字母?

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? Which four letters are thieves afraid of? The post office has thousands of letters.A thief(小偷) is afra The post oficehas thousands of letters.A thief is afraid of the post office has thousands of letters.A thief is afraid o The post pffice has thousands of letters.A thief is afraid f Which four letters can frighten a thief? 小偷害怕警察.The thief ___ ____of police.（翻译）