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.

Example

Input

123
55
1000
0


Output

6
10
1
#include <iostream>
#include <string>

int main() {
    std::string s;

    while (std::cin >> s) {
        if (s == "0") break;

        int rec = 0;
        for (const auto &c: s) rec += (c - '0');

        std::cout << rec << std::endl;
    }
}
