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(void){
    char s[1000];
    int i = 0;
    int sum = 0;

    while(1){
        scanf("%s", s);
        if(s == "0")
            break;

        while(s[i]){
            sum += s[i] - '0';
            i++;
        }
        printf("%d\n", sum);
        sum = 0;
        i = 0;
    }
    return 0;
}