#include<iostream>
#include<string>
using namespace std;

int main(){
    string s;
    int sum;
    while(cin>>s&&s!="0"){
        sum=0;
        for(int i=0;s[i]!='\0';i++)sum+=s[i]-'0';
        cout<<sum<<endl;
    }
    return 0;
}

### Prompt

Please formulate a CPP solution to the following problem:

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

### Response

```cpp
#include<iostream>
#include<string>
using namespace std;

int main(){
    string s;
    int sum;
    while(cin>>s&&s!="0"){
        sum=0;
        for(int i=0;s[i]!='\0';i++)sum+=s[i]-'0';
        cout<<sum<<endl;
    }
    return 0;
}

```