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>
#include <string.h>

int main(int argc, char *argv[])
{
  int sum;
  char num[1000 + 2];
  int i;

  while (1) {
    fgets(num, 1000 + 2, stdin);
    num[strlen(num) - 1] = '\0';

    sum = 0;
    for (i = 0; i < strlen(num); i++) sum += num[i] - 0x30;

    printf("%d\n", sum);
  }

  return 0;
}