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>
int main(void){
	char a[1500];
	int s = 1;
	for (; s != 0;){
		s = 0;
		scanf("%s", a);
		for (int i = 0; i < strlen(a); i++)s = s + a[i] - 48;
		if(s!=0) printf("%d\n", s);
	}
	return 0;
}