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>

#define ll long long

using namespace std;

int main(){
	ll n,i,sum;
	string s;
	
	while(1){
		cin>>s;
		if(s=="0") break;
		n=s.size();
		sum=0;
		for(i=0;i<n;i++){
			sum+=s[i]-'0';
		}
		cout<<sum<<"\n";
	}
}
