#include <iostream>
#include <math.h>

using namespace std;

void sumNum(){
    int a;
    cin>>a;
    int sum=0;
while (a>0)
    {
       int d=a%10;
       sum+=d;
       a=a/10;
        
    }
    cout<<sum<<endl;
}


int main(){

// int b=1;
//         while (b!=0)
//         {
//             sumNum(); 
//             cout<<"You want to exit press 0 continue 1;";
//             cin>>b;
            
            
//         }
int b;
        do
        {
          sumNum(); 
           cout<<"You want to exit press 0 continue 1;";
             cin>>b;
        } while (b!=0);
        
        cout<<"Thanks for coming";
 

}