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 ch[1001];
	int sum, i;
	
    while(1){
    	scanf("%s", ch);
    	if (ch == "0") break; 
        sum = 0; i = 0;
        while(ch[i]){
            sum += ch[i] - '0';
            i++;
        }
        printf("%d\n", sum);
    }
    return 0;
}