#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long cuvinte1,i, litere,x, cuvinte2;
char s[10000000001];
int main()
{
    fin.getline(s,10000000001);
    x=strlen(s);
    for(i=0;i<x;i++)
        {if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')) litere++;
         if(((s[i]<'a'||s[i]>'z')&&(s[i]<'A'||s[i]>'Z'))&&((s[i+1]>='a'&&s[i+1]<='z')||(s[i+1]>='A'&&s[i+1]<='Z'))) cuvinte1++;
         if(((s[i]<'a'||s[i]>'z')&&(s[i]<'A'||s[i]>'Z'))&&((s[i-1]>='a'&&s[i-1]<='z')||(s[i-1]>='A'&&s[i-1]<='Z'))) cuvinte2++;}
        if(cuvinte1>cuvinte2) fout<<litere/cuvinte1;
            else fout<<litere/cuvinte2;
    return 0;
}