A crafty woman sent a short message to her boss.

1 1-9=5, the real answer should be 2, with an extra 3, suggesting that the secretary asked the boss if he could accommodate mistress; Good night, if you leave late, it's a day off. If you leave safely, it's a family girl, which means you're free and you have a wife at home. The secretary has made it clear that she has no face to stay in the company, so she resigned.