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>
using namespace std;
int main(){
  while(1){
    string s; cin >> s;
    if(s=="0")break;
    int ans=0;
    for(int i=0; i<s.size(); i++){
      ans += stoi(s.substr(i,1));
    }
    cout <<ans <<endl;
  }
}