#include<bits/stdc++.h>
using namespace std;
int main(){
	string s;
	int sum=0;
	while(scanf("%s",&s)!=EOF){
		int len=s.size();
		for(int i=0;i<=len-1;i++){
			if(s[i]>='A'&&s[i]<='Z')sum++;
			if(s[i]>='a'&&s[i]<='z')sum++;
			if(s[i]>='0'&&s[i]<='9')sum++;
		}
	}
	cout<<sum;
}