#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
	int ans;
    for(;getline(cin,s);)
    {
        for(int i=1;i<=s.size();i++)
	    {
		  if(s[i]>='A'&&s[i]<='Z')
		  ans++;
		  if(s[i]>='a'&&s[i]<='z')
		  ans++;
		  if(s[i]>='0'&&s[i]<='9')
		  ans++;
	   }
    }
	
	cout<<ans;
	return 0;
}