#include <cstdio>
#include <cctype>
using namespace std;

int main()
{
    char ch;
    int nrlit = 0, nrcuv = 0;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    ch = fgetc(stdin);
    while(ch != EOF) {
        if(isalpha(ch)) {
            ++nrcuv;
            while(isalpha(ch)) {
                ch = fgetc(stdin);
                ++nrlit;
            }
        }
        else {
            ch = fgetc(stdin);
        }
    }
    printf("%d\n", nrlit / nrcuv);
    return 0;
}