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: Accepted)

using System;
class A
{
static void Main()
{while(true){
string a=Console.ReadLine();
if(a=="0"){break;}
int ans=0;
for(int i=0;i<a.Length;i++){
ans+=int.Parse(a.Substring(i,1));
}Console.WriteLine(ans);
}}
}