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

signed main() {
	string s;
	while (cin >> s and s != "0") {
		int sum = 0;
		for (int i = 0; i < s.size(); ++i) {
			sum += s[i] - '0';
		}
		cout << sum << endl;
	}
}


### Prompt

Your challenge is to write 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;

signed main() {
	string s;
	while (cin >> s and s != "0") {
		int sum = 0;
		for (int i = 0; i < s.size(); ++i) {
			sum += s[i] - '0';
		}
		cout << sum << endl;
	}
}


```