#include<fstream>
#include<string>
#include<ctype.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
char s[1100000],d=26;

int main()
{
int i,nrlit,nrcuv,n,lmedie;
in.get(s,1100000,d);
n=strlen(s);
nrcuv=nrlit=0;
if(isalpha(s[0]))
	nrcuv=nrlit=1;
for(i=1;i<n;++i)
	{
	if(isalpha(s[i])) {
		nrlit++;
		if(isalpha(s[i-1])==0) nrcuv++;
		} 	
	}
if(nrcuv==0){
	out<<0;return 0;
}
	//nrcuv=1;
lmedie=nrlit/nrcuv;

out<<lmedie;

return 0;
}