#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())!=EOF)
    {
        if(isalpha(cur) || isdigit(cur))
            len++;
        else
            if(isalpha(prec) || isdigit(prec))
            num++;
            prec=cur;
    }
    if(isalpha(prec)) num++;
    fout<<len/num;
    return 0;
}