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;

string s;

int main(){
 while(1){
  cin>>s;
  if(s=="0") break;
  int ans=0,S=s.size();
  for(int i=0;i<S;i++) ans+=s[i]-'0';
  cout<<ans<<endl;
 }
}