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 <cstdio>
using namespace std;

int main(){
	string x;
	while(1){
	int num,k=0;
	cin >> x;
	if(x=="0"){
		break;
	}
	for(int i=0;x[i];i++){
		num=x[i]-'0';
		k+=num;
	}
		cout << k << endl;
	}
return 0;
}