#include <fstream>
#include <cstring>
using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
	char a, b = 0;
	int p = 0, n = 0;
		
	while( fin.get(a) )
	{
			
		if ( a >= 65 && a <= 90 || a >= 97 && a <= 122 )
			n++;
		else
			if ( b != 0 && ( b >= 65 && b <= 90 || b >= 97 && b <= 122) )
				p++;
		b = a;	
		}
		
		fout << n/p;
		
		fin.close();
		fout.close();
		return 0;
}