Which of the four non-monks is the monk who holds his chin?

The monk holding his chin is indecent among the four monks. The four young monks were all sitting in a squatting position, looking so naive: the first one covered his ears with his hand, the second one supported his cheeks with his hand, the third one covered his eyes with his hand and the fourth one covered his mouth with his hand. It vividly shows the cautious, kind and indisputable life character. That is to say, don't see anything inappropriate, don't listen to anything inappropriate, don't say anything inappropriate, and don't do anything inappropriate. The meaning behind "Four Monks" comes from The Analects of Confucius Yan Yuan. Content Excerpt: Confucius said, "see no evil, don't listen if you are indecent, don't say anything if you are indecent, don't move if you are indecent.