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

int main(){
  string num;
  while(cin>>num && num!="0"){
    int sum=0;
    for(unsigned int i=0;i<num.size();i++){
      sum+=(int)(num[i]-'0');
    }
    cout<<sum<<endl;
  }
  return 0;
}
### Prompt

In cpp, your task is to solve 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<cstring>
using namespace std;

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