#include <stdio.h>
using namespace std;
int main()
{
    FILE *fin,*fout;
    fin=fopen("text.in","r");
    fout=fopen("text.out","w");
    char ch;
    int c1=0,c2=0;
    bool as=1;
    while(!feof(fin))
    {
        fscanf(fin,"%c",&ch);
        if('a'<=ch&&'z'>=ch) {as=0; c1++;}
        else if('A'<=ch&&'Z'>=ch) {c1++; as=0;}
        else
        {
            if(ch!='-'&&ch!=','&&as==0)
            {
                c2++;
                as=1;
            }
        }
    }
    c2++;
    fprintf(fout,"%i",c1/c2);
}