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>
#include<cctype>
#include<cstdio>
#include<string>
using namespace std;
int main(){
string num;
while(true){
cin>>num;int sum=0;

for(int i=0;i<num.size();i++){
	sum+=num[i]-'0';
}
if(sum==0)break;
cout<<sum<<endl;
}
 return 0;
}