#include <iostream>
#include <fstream>
#include<cstring>
using namespace std;

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


int main()
{ char s[256];
in.getline(s,256);
int cuv=0,lit=0;
for(int i=0; s[i];i++)
    if(isalpha(s[i]))lit++;
    else if(isalpha(s[i-1]))cuv++;
  out<<lit/cuv;
    return 0;
}