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

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

char alfabet[] = "abcdefghijklmnopqrstuvwxqzABCDEFGHIJKLMNOPQRSTUVQXYZ";


int main()
{
  char cuv[1000],*p;
  int n = 0;
  int lng = 0;

  while(in>>cuv)
  {
    n++;
    for(int i=0;i<strlen(cuv);++i)
      {
        if(strchr(alfabet,cuv[i]))
        {
          lng++;
        }
      }
  }

  out<< 1LL * lng/n;


}