#include <iostream>

using namespace std;

int main()
{
	string num;
	int sum;
	while(true) {
		sum = 0;
		cin >> num;
		if(num == "0")
			break;
		for(int i = 0; i < num.size(); ++i) {
			sum += num[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 <iostream>

using namespace std;

int main()
{
	string num;
	int sum;
	while(true) {
		sum = 0;
		cin >> num;
		if(num == "0")
			break;
		for(int i = 0; i < num.size(); ++i) {
			sum += num[i] - '0';
		}
		cout << sum << endl;
	}
}
```