#include<iostream>
#include<string>
using namespace std;
int main()
{
    string n;
    cin>>n;
    for(int i=0;i<n.length();i++)
    if(n[i]==1||n[i]==2||n[i]==3||n[i]==4||n[i]==5||n[i]==6||n[i]==7||n[i]==8||n[i]==9||n[i]==0)
    {
        cout<<n.sum();
    }
    
    return 0;
}