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/*#include <bits/stdc++.h>
using namespace std;
ifstream in ("ciur.in");
ofstream out ("ciur.out");
int v[2000001];
int main(){
int n,i,j,k,m=0;
cin>>n;
for(i=2; i<=n; i++){
if(v[i]==0){
for(j=i+1; j<=n; j++){
if(j%i==0){
v[j]++;
}
}
}
}
for(k=2; k<=n; k++){
if(v[k]==0){
m++;
}
}
cout<<m;
return 0;
}*/
#include <bits/stdc++.h>
using namespace std;
ifstream in ("cfdist.in");
ofstream out ("cfdist.out");
int v[10];
int main(){
int n,i=0,m=0;
cin>>n;
while(n!=0){
if(v[n%10]==0){
m++;
}
v[n%10]++;
n/=10;
i++;
}
cout<<m;
return 0;
}