#include <bits/stdc++.h>
using namespace std;
int let,word;
char s[10000000];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    cin.sync_with_stdio(false);
    cin.tie(0);
    while(cin>>s)
    {
        char ult=' ';
        int n=strlen(s);
        for(int i=0; i<n; ++i)
        {
                if(isalpha(s[i]))
                {
                    let++;
                    if(!isalpha(ult))word++;
                }
                ult=s[i];
        }
    }
    cout<<let/word;
    return 0;
}