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


ifstream f("text.in");
ofstream g("text.out");

char c1,c2,s[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

long long nrlit,nrcuv;

int main()
{
    c1=' ';
    while(f.get(c2))
    {
		if( strchr(s,c2) != 0 ) nrlit++;
		else if( strchr(s,c1) != 0) nrcuv++;
		c1=c2;
    }
    g<<nrlit/nrcuv;
}