#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  while (cin >> s, s != "0") {
    int ans = 0;
    for (int i = 0; i < s.size(); i++) {
      ans += s[i] - '0';
    }
    cout << ans << "\n";
  }
}

### Prompt

In CPP, your task is to solve the following problem:

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() {
  string s;
  while (cin >> s, s != "0") {
    int ans = 0;
    for (int i = 0; i < s.size(); i++) {
      ans += s[i] - '0';
    }
    cout << ans << "\n";
  }
}

```