#include<fstream.h>
#include<ctype.h>

char c,aux;
unsigned int litere,cuvinte,medie;

main()
{
    ifstream In("text.in");
    ofstream Out("text.out");

    In>>c;
    if(isalpha(c)) {litere++;cuvinte++;}
    aux=c;

    while(In>>c)
    {
	if(isalpha(c)) litere++;
	if(isalpha(c) && !isalpha(aux)) cuvinte++;
	aux=c;
    }

    if(litere && cuvinte) medie=litere/cuvinte;
    Out<<medie<<'\n';
    In.close();
    Out.close();
    return 0;   

}