package main

import (
	"fmt"
)

func main() {
	var S string
	var count int
	var state = 'I'
	fmt.Scanln(&S)
	for _, r := range S {
		switch state {
		case 'K':
			if r == 'U' || r == '?' {
				state = 'U'
			}
		case 'U':
			if r == 'R' || r == '?' {
				state = 'R'
			}
		case 'R':
			if r == 'O' || r == '?' {
				state = 'O'
			}
		case 'O':
			if r == 'I' || r == '?' {
				state = 'I'
				count++
			}
		case 'I':
			if r == 'K' || r == '?' {
				state = 'K'
			}
		}
	}
	fmt.Println(count)
}