#include <stdio.h>

using namespace std;

int main()
{
    FILE *fin=fopen("text.in","r"), *fout=fopen("text.out","w");

    char c;
    int nrt=0,lt=0;
    int lcur=0;
    char a;
    while(fscanf(fin,"%c",&c)!=EOF)
    {
        if(('A' <= c && c <= 'Z') || ('a' <= c && c<= 'z'))
        {
            if(lcur>0)
                lcur++;
            else
            {
                nrt++;
                lcur=1;
            }
        }
        else
        {
            lt+=lcur;
            lcur=0;
        }
        a=c;
    }

    if(a-'A' > 0)
        nrt++;

    fprintf(fout,"%d",lt/nrt);

    return 0;
}