Problem:
Sum of Numbers

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.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in C++ (judge verdict: Time Limit Exceeded)

#include<iostream>
using namespace std;
int main(){

while(1){
int x,y=0;
cin>>x;
if(x=0)break;

 while(x>0){
  y += x%10;
  x /= 10;
 }

}

}