//Bou Marian Catalin
#include<iostream.h>
#include<string.h>
void main()
{char c[65536];
int n,i,cuv=0,lit=0;
cin.getline(c,65536);
n=strlen(c);
for(i=0;i<n;i++)
if((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))lit++;
else if((c[i-1]>='a'&&c[i-1]<='z')||(c[i-1]>='A'&&c[i-1]<='Z'))cuv++;
n--;if((c[n]>='a'&&c[n]<='z')||(c[n]>='A'&&c[n]<='Z'))cuv++;
cout<<(int)lit/cuv<<'\n';}