#include<fstream.h>
#include<stdio.h>
#include<string.h>
#define NM 1048576

int main()
{
ifstream fin("text.in");
ofstream fout("text.out");
int i,cuv=0,car=0,l;
char s[NM+1];
fin.get(s,NM);
l=strlen(s);
for(i=0;i<l;i++)
	{
	if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')car++;
	if((s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')&&
		!(s[i+1]>='a'&&s[i+1]<='z'||s[i+1]>='A'&&s[i+1]<='Z'))cuv++;
	}
fout<<car/cuv;
return 0;
}