#include <bits/stdc++.h>
using namespace std;
int main() {
    string s;
    while (cin >> s, s != "0") {
        int res = 0;
        for (auto c: s) {
            res += c - '0';
        }
        cout << res << endl;
    }
}

### Prompt

Generate a cpp solution to 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 res = 0;
        for (auto c: s) {
            res += c - '0';
        }
        cout << res << endl;
    }
}

```