#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

char s[99999999];

ifstream in("text.in");

ofstream out("text.out");
 
void citire()
{
in.get(s,99999999);
}
void count()
{
long long int k=0,z=0;
for(register long int i=0;i<strlen(s);i++)
{
if((int)s[i]>=65 and (int)s[i]<=90)
{
k++;
if((int)s[i+1]<65 or (int)s[i+1]>90) if((int)s[i+1]<97 or (int)s[i+1]>122) z++;
}
if((int)s[i]>=97 and (int)s[i]<=122)
{
k++;
if((int)s[i+1]<97 or (int)s[i+1]>=122) if((int)s[i+1]<65 or (int)s[i+1]>90) z++;
}
}
out<<k/z;
}
 
int main()
{
citire();
count();
}