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 <bits/stdc++.h>
using namespace std;
int main() {
	while (true) {
		string s;
		cin >> s;
		if (s == "0") break;
		int ans = 0;
		for (int i = 0; i < s.length(); i++) {
			int x = s.at(i) - '0';
			ans += x;
		}
		cout << ans << endl;
	}
}
