#include <fstream>
#include <iostream>
using namespace std;

bool ver(char x) {
	bool cond=false;
	if((int)x>=65&&(int)x<=90) cond=true;
	if((int)x>=97&&(int)x<=122) cond=true;
	return cond;
}

int main() {
	char x;
	int cuv=0,lit=0;
	FILE *fin;
	fin=fopen("text.in","r");
	ofstream fout("text.out");
	while(!feof(fin)) {
		fscanf(fin,"%c",&x);
		if(ver(x)) {
			cuv++;
			do {
				lit++;
				fscanf(fin,"%c",&x);
			} while(ver(x));
		}
	}
	fout<<lit/cuv;
}