#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int lit, cuv;

bool litera(char x)
{
    return ((x>='A'&&x<='Z')||(x>='a'&&x<='z'));
}

int main()
{
    char s,ss;
    fin.get(ss);
    fin.get(s);
    if(litera(ss))
        lit++;
    while(s!='\n')
    {
        if(litera(s))
            lit++;
        else if(litera(ss))
            cuv++;
        ss=s;
        fin.get(s);
    }
    fout<<lit/cuv<<'\n';
    return 0;
}