#include <iostream>
#include <string.h>
using namespace std;
char s[60];
int i,k,d;
int main()
{
    cin.getline(s,60);
    for(i=0;i<strlen(s);i++){
    if(s[i]>='a'&& s[i]<='z'|| s[i]>='A'&&s[i]<='Z')
    k++;
    if(s[i]==' ' && s[i+1]!=' ' || (s[i]>='a'&& s[i]<='z'|| s[i]>='A'&&s[i]<='Z') && s[i+1]=='-')
        d++;}
    cout<<k/d;
    return 0;
}