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<string>

int main(){

	std::string str;
	while (std::cin >> str){
		if (str == "0")break;

		int sum = 0;
		for (int i = 0; i < str.size(); i++)sum += str[i] - '0';
		std::cout << sum << std::endl;
	}
	return 0;
}