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() {
string n;
while(true){
  cin>>n;
  if(n[0]-'0'==0)break;
  int sum=0;
  for(int i=0;n[i]!='\0';i++){
  sum+=n[i]-'0';
  }
  cout<<sum<<endl;
}
  return 0;
}