#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
char a[100];
int main()
{
    gets(a);
    int x=strlen(a);
    int ans=0;
    for(int i=0;i<x;i++)
    {
        if(a[i]>='A'&&a[i]<='Z')
        ans++;
        if(a[i]>='a'&&a[i]<='z')
        ans++;
        if(a[i]>='0'&&a[i]<='9')
        ans++;
    }
    cout<<ans<<endl;
}