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)

#define _USE_MATH_DEFINES
#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <math.h>
#include <string>
#include <sstream>

using namespace std;
int main() {
	while (true) {
		string x;
		if (x == "0")break;
		int sum = 0;
		for (int i = 0; i < x.size(); i++) {
			sum += x[i] - '0';
		}
		cout << sum << endl;
	}
	return 0;
}