#include <bits/stdc++.h>
using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

inline bool word(char c)
{
    return ((c >= 'a' && c <= 'z') || (c >= 'A' && c <='Z'));
}

int main()
{
    int cnt = 0, len = 0, no = 0;
    char c;
    while(fin >> noskipws >> c)
    {
        if(word(c))
        {
            if(!cnt)
            {
                no++, cnt = 1;
            }
            len++;
        }
        else
            cnt = 0;
    }
    if(no)
        fout << len / no;
    else
        fout << 0;
}