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 <ctype.h>

int main(void){
	char ch[1001];
	int i;
	int sum;
	while(1){
		scanf("%s",ch);
		i = 0;
		sum = 0;
	while(ch[i] != '\n'){
		sum += (ch[i] - '0');
		i++;
	}
	printf("%d\n",sum);
	}
	return 0;
}