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