#include <cstdio>
#include <string.h>
using namespace std;
int main()
{
    char a[6];
    gets(a);
    int ans=0;
    int n=strlen(a);
    for(int i=0;i<n;i++){
        if (a[i]>='0'&&a[i]<='9')
        ans++;
      else  if(a[i]>='A'&&a[i]<='Z')
        ans++;
      if(a[i]>='a'&&a[i]<='z')
        ans++;
    }
    cout<<ans<<endl;
    return 0;
}```