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()
{
	char a[1000];
	int sum = 0;
	int i;
	
	while(1)
	{
		scanf("%s",a);
		if(a[0] == 0) break;
		
		for(i = 0; i < 1000; i++)
		{
			if(a[i] == '\0') break;
			sum += a[i];
		}
		
		printf("%d\n",sum);
	}
	
	return 0;
}