#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[100001];
    f.getline(s,100001);
    n=strlen(s);
    if (('a'<=s[0]&&s[0]<='z')||('A'<=s[0]&&s[0]<='Z'))
    {
        o++;
    }
    for (i=1;i<=n;i++)
    {
        if (('a'<=s[i]&&s[i]<='z')||('A'<=s[i]&&s[i]<='Z'))
        {
            o++;
        }
        else
        {
            if (('a'<=s[i-1]&&s[i-1]<='z')||('A'<=s[i-1]&&s[i-1]<='Z'))
            {
                c++;
            }
        }
    }
    if (('a'<=s[n]&&s[n]<='z')||('A'<=s[n]&&s[n]<='Z'))
    {
        c++;
    }
    g<<o/c;
    return 0;
}