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 <cstring>
using namespace std;

int main(){
	char s[1001];
	while(cin >> s){
		int sum = 0;
		if(s[0]=='0') break;
		for(int i=0; i<strlen(s); i++){
			sum +=s[i]-'0';
		}

		cout << sum << "\n";
	}
}