#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{int o=0,c=0,i,n;
    char s[1001];
    f.getline(s,1001);
    n=strlen(s);
    for (i=1;i<=n;i++)
    {
        if (!('a'<=s[i]&&s[i]<='z')&&!('A'<=s[i]&&s[i]<='Z'))
        {
            if (('a'<=s[i-1]&&s[i-1]<='z')||('A'<=s[i-1]&&s[i-1]<='Z'))
            {
                c++;
            }
            else
            {
                if (i==1)
                {
                    o++;
                }
            }
            o++;
        }
    }
    if (('a'<=s[n]&&s[n]<='z')||('A'<=s[n]&&s[n]<='Z'))
    {
        c++;
    }
    g<<(strlen(s)-o)/c;
    return 0;
}