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>

using namespace std;

int main()
{
	string x;

	while (cin >> x, x != "0") {
		int y = 0;
		while (!x.empty()) {
			y += x[0] - '0';
			x = x.substr(1);
		}
		cout << y << endl;
	}
}