#include <bits/stdc++.h>
using namespace std;
int solve(string &s) {
  int len = s.length();
  int ret = 0;
  for (int i = 0; i < len; ++i) {
    if (s[i] == 'V' && i + 1 < len && s[i + 1] == 'K') {
      ++ret;
    }
  }
  return ret;
}
int main() {
  string s;
  while (cin >> s) {
    int ans = solve(s);
    int len = s.length();
    char c;
    for (int i = 0; i < len; ++i) {
      c = s[i];
      if (s[i] == 'V') {
        s[i] = 'K';
      } else {
        s[i] = 'V';
      }
      ans = max(ans, solve(s));
      s[i] = c;
    }
    cout << ans << endl;
  }
  return 0;
}
