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
//ITP 1_8_B
#include <iostream>
using namespace std;

int main(){
	string a;
	while (getline(cin, a), a != "0") {
		int r = 0;
		for (char c : a) {
			r += c - '0';
		}
		cout << r << endl;
	}
	
	return 0;
}

