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(){

  char number[1001];
  int i,num,sum;
  sum = 0;

  while(1){

    scanf("%s", number);

    for ( i = 0 ; i < strlen(number) ; i++ ){

      num = number[i];
      sum = sum + num;

    }

    if ( sum == 0 ) break;
    printf("%d\n", sum);
    sum = 0;
    
  }

  return 0;
  
}