规则Rules：
标准数独基础上，提示表示其周围数字的和，相同字母代表相同的数码，不同字母代表不同的数码。
Classic rules applied. Additionally, the clue shows the sum of numbers around it. Same letter shows same digit, different letters show different digits.
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
