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<cstdio>
#include<cstring>
using namespace std;

int main(){
	char str[1001];

	while(1){
		scanf("%s",str);
		if(str[0]=='0')break;
		int sum=0;
		for(int i=0;i<strlen(str);i++){
			sum+=(str[i]-'0');
		}
		printf("%d\n",sum);
	}
	return 0;
}