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(int argc, const char * argv[]) {
    int i, x;
    int sum=0;
    
    while(1){
        char number[1001]={0};
        scanf("%s",number);
        
        x=strlen(number);
        
        for(i=0;i<x;i++){
            sum+=number[i]-'0';
        }
        if (sum==0) {
            break;
        }
        printf("%d\n",sum);
    }
    return 0;
}