#include <bits/stdc++.h>
using namespace std;
int int_len(int n) {
  int s = 0;
  while (n != 0) s++, n /= 10;
  return s;
}
int int_sum(int n) {
  int m = 0, s = 0, a = n;
  while (a != 0) s++, a /= 10;
  for (int i = s - 1; i >= 0; i--)
    m += n / ((int)pow(10, i)) - (n / ((int)pow(10, i + 1))) * 10;
  return m;
}
int vec_sum(vector<int> v) {
  int n = 0;
  for (int i = 0; i < v.size(); i++) n += v[i];
  return n;
}
int main() {
  int s = 123;
  vector<int> v = {1, 2, 3};
  cout << int_len(s) << endl;
  cout << int_sum(s) << endl;
  cout << vec_sum(v) << endl;
}
