#include <bits/stdc++.h>
#include <cstdint>
#include <sys/time.h>

typedef std::int_fast32_t  s32;
typedef std::uint_fast32_t u32;
typedef std::int_fast64_t  s64;
typedef std::uint_fast64_t u64;

const unsigned long mod = 1000000007;
const double EPS = 0.00000001;
const int INF = (1 << 29);

typedef std::pair<int, int> pii;

auto main() -> int
{

  std::string str;
  std::cin >> str;

  char s[6] = "KUROI";

  int res = 0;
  for(;;) {
    int i = 0;
    int j;
    for(j = 0; j < str.size(); ++j) {
      if( str[j] == s[i] ) {
        str[j] = '_';
        i += 1;
        if( i == 5 ) break;
      }
    }

    if( j == str.size() ) {
      break;
    }
    res += 1;
  }
  
  for(;;) {
    int i = 0;
    int j;
    for(j = 0; j < str.size(); ++j) {
      if( str[j] == s[i] or str[j] == '?' ) {
        str[j] = '_';
        i += 1;
        if( i == 5 ) break;
      }
    }

    if( j == str.size() ) {
      break;
    }
    res += 1;
  }

  std::cout << res << std::endl;
  
  return 0;
}