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

inline bool EsteLitera(char x)
{
    if(x>='a' && x<='z') return true;
    if(x>='A' && x<='Z') return true;
    return false;
}


int main()
{
    int i;
    char s,last;
    while(fin.get(s))
    {
        if(EsteLitera(s))
        {
            nrl++;
            while(fin.get(s) && EsteLitera(s))
                nrl++;
            nrcuv++;
        }
    }
    i = nrl/nrcuv;
    fout<<i<<"\n";
    fout.close();
    return 0;
}