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;
#define int long long

string s;
int ans;
signed main(){
	while (cin >> s && s > "0"){
		ans = 0;
		for (int i = 0; i < s.length(); i++){
			ans += s[i] - '0';
		}
		cout << ans << endl;
	}
	return 0;
}
	

