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 <bits/stdc++.h>
using namespace std;
#define ll long long

int main(){
  
  string str;  
  while(cin >> str, str!="0"){
    int sum = 0;
    for(char c: str)
      sum += c - '0';
    cout << sum << endl;
  }
  
  return 0;
}