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 <iostream>
using namespace std;

int main(int argc, char const *argv[])
{
	int x=0;
	int ans;

	while(true)
	{
		ans=0;
		cin >> x;

		if(x==0)
		{
			break;
		}
		while(x>=10)
		{
			ans += x%10;
			x /= 10;
		}
		ans += x;
		cout << ans <<endl;
	}
	return 0;
}