#include <fstream>
#include <cctype>
#include <cstdio>
using namespace std;
int main()
{
	unsigned long cuv=1,litere=0,medie;
	char ch1,ch2;
	FILE *IN=fopen("text.in","r");
	FILE *OUT=fopen("text.out","w");
	while(!feof(IN))
	{
		fscanf(IN,"%c",&ch1);

		if(isalpha(ch1)&&isalpha(ch2)) ++litere;
		if(isalpha(ch1)&&!(isalpha(ch2))) {++litere;++cuv;}
		ch2=ch1;
	}
	medie=litere/cuv;
	fprintf(OUT,"%d\n",medie);
	return 0;
}