#include <bits/stdc++.h>
using namespace std;
char a;
int b, ans1, c[10], d;
int main() {
  cin >> a >> b;
  if (a == 'A') {
    ans1 = 1;
    for (; b > 0; b /= 10) c[++d] = b % 10;
    for (int i = 1; i <= d; i++) {
      if (c[i] == 1)
        ans1 += 10;
      else
        ans1 += c[i];
    }
  }
  if (a != 'A') {
    for (; b > 0; b /= 10) c[++d] = b % 10;
    for (int i = 1; i <= d; i++) {
      if (c[i] == 1)
        ans1 += 10;
      else
        ans1 += c[i];
    }
  }
  cout << ans1;
  return 0;
}
