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>
int main(){
	int i, s;
	char d[1001];
	while (i = 0, s = 0,std::cin >> d){
		while (d[i] - '\0'){
			s += d[i] - '0';
			++i;
		}
		if (s == 0)break;
		std::cout << s << std::endl;
	}
}