#include <cstdio>
using namespace std ;

int main()
{
    FILE *f = fopen ("text.in", "r") ;
    FILE *g = fopen ("text.out", "w") ;
    char c ;
    int cuv = 0, litere = 0 ;
    while ((c=fgetc(f))!=EOF)
    {
        if (c >= 'a' && c <= 'z' || c >= 'A' && c<= 'Z')
        {
            cuv++ ;
            while (c >=  'a' && c <= 'z' || c >= 'A' && c<= 'Z')
            {
                litere++ ;
                c = fgetc(f) ;
            }
        }
    }
    fprintf (g, "%d", litere/cuv) ;
    fclose(f) ;
    fclose(g) ;
}