#[allow(unused_imports)] use std::cmp::*; #[allow(unused_imports)] use std::collections::*; fn getline() -> String { let mut ret = String::new(); std::io::stdin().read_line(&mut ret).ok().unwrap(); ret } fn main() { let s: Vec<_> = getline().trim().chars().collect(); let n = s.len(); let mut hm = HashMap::new(); hm.insert([0; 4], 0); let t = ['K', 'U', 'R', 'O', 'I']; for i in 0..n { let mut nxt = vec![]; for j in 0..5 { if s[i] != t[j] && s[i] != '?' { continue; } for (&k, &v) in &hm { if j >= 1 && k[j - 1] == 0 { continue; } let mut nxtk = k; if j >= 1 { nxtk[j - 1] -= 1; } let mut nxtv = v; if j <= 3 { nxtk[j] += 1; } else { nxtv += 1; } nxt.push((nxtk, nxtv)); } } for (k, v) in nxt { let ent = hm.entry(k).or_insert(0); *ent = max(*ent, v); } } println!("{}", hm.values().max().unwrap()); }