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(){
  int sum = 0;
  while(1){
	string str;
	cin >> str;
	if(str=="0") break;

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