#include <bits/stdc++.h>

using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
char cur,prec;
int len,num;
int main()
{
    prec=fin.get();
    while((cur=fin.get())!='\n')
    {
        //fout<<prec<<" ** "<<cur<<endl;
        if(isalpha(cur))
            len++;
        else if(isalpha(prec)) num++;
            prec=cur;

    }
    //fout<<endl<<prec;
    if(isalpha(prec)) num++;
    //fout<<len<<" "<<num<<endl;
    fout<<len/num;
    return 0;
}