#include<iostream>
#include<string>
#include<ctype.h>
using namespace std;
int main(){
	string a;
	int sum=0;
	cin>>a;
	for(auto c:a){
		if(isalnum(c)||isalpha(c)){
			++sum;
		}
		
	}
	cout<<sum;
	return 0;
}