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 x[4];
        while(1) {
                scanf("%s", x);

                if (x == 0) break;

                int result = 0;
                int i = 0;
                while (x[i] != '\0') {
                                result += x[i] - '0';
                                i++;
                }
                printf("%d\n", result);
        }
}