#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    char a[5000];
    int i,x=0,y=0,v;
    fin.get(a,5000);
    v=strlen(a);
    for(i=0;i<v;i++)
    {
        if((65<=a[i])&&(a[i]<=90))
        {x++;}
        else {
            if((97<=a[i])&&(a[i]<=122))
            {x++;}
            else
            {  while((a[i+1]<65)||(a[i+1]>122)||((a[i+1]>90)&&(a[i+1]<97)))
            i++;
            y++;

            }
            }

    }
    fout<<x/y;
}