#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 5;
const int INF = 0x3f3f3f3f;
int vis[105];
int main() {
  string s;
  cin >> s;
  int len = s.size();
  int ans = 0;
  for (int i = 0; i < len - 1; i++) {
    if (s[i] == 'V' && s[i + 1] == 'K') ans++;
  }
  for (int i = 0; i < len; i++) {
    char ch = s[i];
    s[i] = 'V';
    int temp = 0;
    for (int j = 0; j < len - 1; j++) {
      if (s[j] == 'V' && s[j + 1] == 'K') temp++;
    }
    s[i] = ch;
    ans = max(ans, temp);
  }
  for (int i = 0; i < len; i++) {
    char ch = s[i];
    s[i] = 'K';
    int temp = 0;
    for (int j = 0; j < len - 1; j++) {
      if (s[j] == 'V' && s[j + 1] == 'K') temp++;
    }
    s[i] = ch;
    ans = max(ans, temp);
  }
  cout << ans << endl;
  return 0;
}
