#include <bits/stdc++.h>
using namespace std;
 
int main() {
  while (1) {
    string x;
    cin >> x;
    if (x == "0") break;
    int sum = 0;
    for (int i = 0; i < x.size(); i++) {
      sum += x.at(i) - '0';
    }
    cout << sum << endl;
  }
}

### Prompt

Develop a solution in cpp to the problem described below:

Write a program which reads an integer and prints sum of its digits.



Input

The input consists of multiple datasets. For each dataset, an integer x is given in a line. The number of digits in x does not exceed 1000.

The input ends with a line including single zero. Your program should not process for this terminal symbol.

Output

For each dataset, print the sum of digits in x.

Example

Input

123
55
1000
0


Output

6
10
1

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
 
int main() {
  while (1) {
    string x;
    cin >> x;
    if (x == "0") break;
    int sum = 0;
    for (int i = 0; i < x.size(); i++) {
      sum += x.at(i) - '0';
    }
    cout << sum << endl;
  }
}

```