#include<iostream>
#include<string>
#include<vector>

int main() {
	std::string str;
	std::cin >> str;

	for (int i = 0; i < str.length(); i++) {
		if (str[i] != 'K' && str[i] != 'U' && str[i] != 'R' && str[i] != 'O' && str[i] != 'I' && str[i] != '\?') {
			str.erase(str.begin() + i);
			i--;
		}
	}
	
	while(str.size() > 0 && str.front() != 'K' && str.front() != '\?') str.erase(str.begin());
	while (str.size() > 0 && str.back() != 'I' && str.back() != '\?') str.erase(str.begin() + str.size() - 1);

	std::string s = "KUROI";
	int pos = 0;
	std::vector<int> d;
	int ans = 0;
	for (int i = 0; i < str.length(); i++) {
		if (str[i] == s[pos] || str[i] == '\?') {
			pos++;
			d.push_back(i);
			if (pos > 4) {
				pos = 0;
				for (int j = 0; j < 5; j++) {
					str[d[j]] = 'T';
				}
				d.clear();
				i = -1;
				ans++;
			}
		}
		if (i == str.length() - 1 && d.size() != 0) {
			str[d.front()] = 'T';
			d.clear();
			i = -1;
			pos = 0;
		}
	}

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