#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[100001];
int nt,nr;
int main()
{
    f.getline(s,100001);nr=0;nt=0;
    for (int i=0;i<strlen(s);i++)
        if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) nt++;
        else if ((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z'))nr++;
    g<<nt/nr;
    return 0;
}