“Okey! Then I am giving you a number, you have to find out the Factorial of that number. Then find the sum of the digits of your result! Suppose the number is 5. You first calculate $5! = 120$, then find sum of the digits $1 + 2 + 0 = 3$. Can you do it?”

所以题目要求的是 $n$ 的 sum of the digits，也就是 $n$ 的各个数位的和，而不是输出格式中的「位数」。