//Bou Marian Catalin
#include<fstream.h>
#include<string.h>
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{char c[65535];
int n,i,cuv=0,lit=0;
fin.getline(c,65535);
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++;
fout<<lit/cuv;
return 0;}