Problem:
Sum of Numbers

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.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in C (judge verdict: Time Limit Exceeded)

#include "stdio.h"

int main(void)
{
	int i;
	int sum;
	char num[1000];

	while(1)
	{
		for(i = 0; i < 1000; i++)
		{
			scanf("%s", &num[i]);
			if (num[i] == '\n')
			{
				break;
			}

			sum += num[i] - '0';

		}
		if (num[0] == '0')
			{
				break;
			}
		printf("%d\n", sum);
	}
	
}