#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 ) || a >= 48 && a <= 57)
						n++;
				else
						if ( ( b >= 65 && b <= 90) || ( b >= 97 && b <= 122 ) || ( a >= 48 && a <= 57 ) &&
						 ( (a <= 65 && a >= 90) || (a <= 97 && a >= 122)  || (a <= 48 && a >= 57) ) )
								p++;
				b = a;	
		}
		
		fout << n/p;
		
		fin.close();
		fout.close();
		return 0;
}