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(1){
		string s;
		cin >> s;
		if(s == "0") return 0;
		int num=0;
		for(int i=0;i<s.size();i++) num+=s[i]-'0';
		cout<<num<<endl;
	}
	return 0;
}