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 "bits/stdc++.h"
using namespace std;

string x;

int main(){
    while (cin >> x, x != "0"){
        int a = 0;
        for (int i = 0; i < x.size(); ++i)
            a += x[i] - '0';
        cout << a << endl;
    }
}