#include <cstdio>
#include <cctype>

int main() {
  int nrcuv, nrlit;
  char cursor;
  FILE *f = fopen("text.in", "r");
  cursor = fgetc(f);
  nrcuv = nrlit = 0;
  while (cursor != EOF) {
    if (isalpha(cursor)) {
      ++nrcuv;
      while (isalpha(cursor)) {
        ++nrlit;
        cursor = fgetc(f);
      }
    } else {
      cursor = fgetc(f);
    }
  }
  fclose(f);
  f = fopen("text.out", "w");
  fprintf(f, "%d\n", nrlit / nrcuv);
  fclose(f);
  return 0;
}