#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main(){
    bool cuv=0;
    string s;
    getline(in,s);
    s.push_back('.');
    int nrLit=0;
    int nrCuv=0;
    for(auto c:s){
        if(c>='a'&&c<='z'){nrLit++;cuv=1;}
        else if(c>='A'&&c<='Z'){nrLit++;cuv=1;}
        else if(cuv){cuv=0;nrCuv++;}
    }
    out<<nrLit/nrCuv;
}