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 a ;
	int sum=0;
	while(1){
		while((a=getchar())!='\0'){
			sum+=atoi(&a);}
		
		if(sum==0){
			break ;}
		else{printf("%d\n",sum);}}
return 0;
	}