#include <bits/stdc++.h>
using namespace std;
int main() {
  string str;
  cin >> str;
  int len = str.length();
  int mx = 0;
  for (int j = 0; j < len; j++) {
    char ch = str[j];
    str[j] = 'V';
    int ans = 0;
    bool flag = false;
    for (int i = 0; i < len; i++) {
      if (str[i] == 'V')
        flag = true;
      else {
        if (str[i] == 'K' && flag) {
          ans++;
          flag = false;
        } else
          flag = false;
      }
    }
    str[j] = ch;
    mx = max(ans, mx);
  }
  for (int j = 0; j < len; j++) {
    char ch = str[j];
    str[j] = 'K';
    int ans = 0;
    bool flag = false;
    for (int i = 0; i < len; i++) {
      if (str[i] == 'V')
        flag = true;
      else {
        if (str[i] == 'K' && flag) {
          ans++;
          flag = false;
        } else
          flag = false;
      }
    }
    str[j] = ch;
    mx = max(ans, mx);
  }
  cout << mx;
  return 0;
}
