6.
#include<iostream>
#include<cstring>
using namespace std;
char x[256];
int main()
{
        int i,s=0;
        cin.getline(x,256);
        for(i=0;i<=strlen(x);i++)
        {
            if(x[i]>='0'&&x[i]<='9')
            {
                s=s+x[i]-48;
            }
        }
        cout<<s;

}