The only line of the input is a string of 7 characters. The first character is letter A, followed by 6 digits. The input is guaranteed to be valid (for certain definition of "valid").
Output a single integer.
A221033
21
A223635
22
A232726
23
| 难度等级： | 5 |
| 总通过次数： | 1 |
| 总提交次数： | 5 |