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(){
	unsigned char num[1000];
	unsigned short ans = 0;
	int i;
	
	while(1){
		
		for(i = 0;i < 1000;i++){
			num[i] = 0;
		}
		scanf("%s", &num);
		
		for(i = 0;num[i] != '\n';i++){
			ans += num[i] - 48;
		}
		
		if(ans == 0){
			break;
		}
		
		printf("%d\n", ans);
		
		ans = 0;
	}
	return 0;
}