#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char sir[1500004];
int main()
{
    int n,i,cl=0,cc=0;
    fin.get(sir,1000004);
    n=strlen(sir);
    for(i=0;i<n;i++){
        if((sir[i]>='A' and sir[i]<='Z') or (sir[i]>='a' and sir[i]<='z'))
            cl++;
        if(sir[i]<'A' or sir[i]>'z')
        {
            if((sir[i-1]>='A' and sir[i-1]<='Z') or (sir[i-1]>='a' and sir[i-1]<='z'))
                cc++;}
        if(sir[i]>'Z' and sir[i]<'a')
        {
            if((sir[i-1]>='A' and sir[i-1]<='Z') or (sir[i-1]>='a' and sir[i-1]<='z'))
                cc++;
        }
    }
    fout<<cl/cc;
    return 0;
}