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
#include <iostream>
#include <string>
using namespace std;

int main() {
	string x;
	int a;

	while (1) {
		cin >> x;
		if (x == "0")
			break;

		a = 0;
		for (int i = 0;i < x.length();i++) {
			a += x[i] - '0';
		}
		cout << a << endl;
	}
}