#include<bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long nrc,nrl,n,i;
char sir[1000004];
int main()
{
    fin.get(sir,1000004);
    i=0;
    n=strlen(sir);
    while(i<n)
    {
        if((sir[i]>='a' and sir[i]<='z') or (sir[i]>='A' and sir[i]<='Z'))
        {
            while((sir[i]>='a' and sir[i]<='z') or (sir[i]>='A' and sir[i]<='Z')) i++,nrl++;
            nrc++;
        }
        i++;
    }
    fout<<nrl/nrc<<'\n';
    return 0;
}