mari p3

#include <iostream>

using namespace std;

int main()
{
    unsigned long n,i,s,aux;
    cin>>n;
    s=0;
    for(i=1;i<=9;i++)
    {
        aux=n;
        while(aux!=0)
            {
            if(aux%10==i){s++;break;}
            aux=aux/10;
            }

    }
    cout<<s;
    return 0;
}