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>
using namespace std;
int main(){
	
	char kazu[1001];
	int sum=0;
	cin>>kazu;
	while(kazu[0]!='0'){
		for(int i=0;kazu[i]!='\0';i++){
			sum+=kazu[i]-'0';
		}
		cout<<sum<<endl;
		sum=0;
		cin>>kazu;
	}
	
				
	return 0;
}