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<cstring>
using namespace std;
int main(void)
{
	int i,l,n;
	char x[1001];
	while(1){
		cin>>x;
		l=strlen(x);
		n=0;
		for(i=0;i<l;i++){
			n=n+x[i]-'0';
		}
		if(n==0) break;
		cout<<n<<endl;
	}
	return 0;
}

