#include <bits/stdc++.h>

using namespace std;

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

char s[10000005];
int n, nrcuv, lg;

int main()
{
    int i;
    fin.getline(s,10000005);
    lg=0;
    n=strlen(s);
    for(i = 0; s[i]; i++)
    {
        if((s[i]>= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
        {
            while((s[i]>= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
            {
                lg++;
                i++;
            }
            nrcuv++;
        }
    }
    fout<<lg/nrcuv<<"\n";
    fout.close();
    return 0;
}