#include<iostream>
using namespace std;
#include<stdio.h>
FILE *f,*g;
char u;
int lungime,litere,x;
int main()
{
    f=fopen("text.in","r");
    g=fopen("text.out","w");
    while(!feof(f))
    {
        fscanf(f,"%c",&u);
        if((u>='a'&&u<='z')||(u>='A'&&u<='Z'))
            lungime++;
        else
        {if(lungime>0)
            litere++;
            x=x+lungime;
            lungime=0;
        }
    }
fprintf(g,"%d",x/litere);
}