Ace It!
说明
F. Ace It!
time limit per test
2 secondsmemory limit per test
64 megabytesinput
standard inputoutput
standard outputInput
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
Output a single integer.
Examples
Input
A221033
Output
21
Input
A223635
Output
22
Input
A232726
Output
23
样例
