#include <cstdio>
#include <ctype.h>
FILE *fin = fopen("text.in","r"), *fout = fopen("text.out","w");
int words,letter;

int main()
{
    char c;
    c = fgetc(fin);
    while (!feof(fin))
    {

        if(isalpha(c))
        { words ++;
            while(isalpha(c))
            {
                letter++;
                c = fgetc(fin);
            }
        }
        c = fgetc(fin);
    }

    fprintf(fout,"%d",letter/words);
    return 0;
}