#include <fstream>
#include <cstring>

using namespace std;

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

char a,b;
long long nr;
int cuv;


int main(){
    while(f.get(a)){
        if((a >= 'a' && a <= 'z') || (a >= 'A' && a <= 'Z'))
            nr++;
        else
            if((b>= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z'))
                cuv++;
        b = a;
    }
    g<<nr/cuv;
    return 0;
}