#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

FILE *fin, *fout;

void read()
{
    char c;
    int nrwords = 0, wlen = 0;

    while((c = fgetc(fin)) != EOF)
    {
        if(isalpha(c))
        {
            nrwords++;
            wlen++;
            while(isalpha(c = fgetc(fin)))
            {
                wlen++;
            }
        }
    }

    fprintf(fout, "%d", wlen/nrwords);
}

int main()
{
    fin = fopen("text.in","r"), fout = fopen("text.out", "w");
    read();
    fclose(fin);fclose(fout);
    return 0;
}