int main()
{
    string st; int count=0,i;
    bool f=false;
    cin >> st;//cout << st.size();
    int sos[st.size()];fill(sos,sos+st.size(),0);
    fo(i,st.size()-1)
    if (sos[i]==0)
    {
        //cout << "1";
        if ((st[i]=='V') && (st[i+1]=='K')) { sos[i]++;sos[i+1]++;count ++ ; }
        if (!f)
        if (((st[i] == 'V') && (st[i+1]=='V')) || ((st[i]=='K') && (st[i+1]=='K'))) { sos[i]++;sos[i+1]++;f=true;count ++ ;}
    }//else cout << sos[i] << " ";
    cout << count;
    return 0;
}