#include<fstream>
#include<string>
using namespace std;
char cuvant [100000];
long i,nrlit,nrc,rez;
int main()
{
	ifstream in("text.in");
	ofstream out("text.out");
	while(in.getline(cuvant,100000))
	for ( i=0; i<strlen(cuvant); ++i )
	{
		if (( cuvant[i]-'a'>=0 && cuvant[i]-'z'>=0 ) || ( cuvant[i]-'A'>=0 && cuvant[i]-'Z'>=0 ) )
		{
			nrc++;
			while((( cuvant[i]-'a'>=0 && cuvant[i]-'z'>=0 ) || ( cuvant[i]-'A'>=0 && cuvant[i]-'Z'>=0 ) ) && i<strlen(cuvant))
			{
				nrlit++;
				i++;
			}
		}		
	}	
	rez=nrlit/nrc;
	out<<rez<<"\n";
	

	return 0;
}