#include<bits/stdc++.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
string s;
int nr=0,nr2=0;
main(){
    getline(f,s);
    if(isalpha(s[0]))nr++;
    for(int i=1;i<s.size();i++){
        if(isalpha(s[i]))nr2++;
        if(isalpha(s[i])&&!isalpha(s[i-1]))nr++;
    }
    g<<int(nr2/nr);
}