use std::cmp::*; use std::io::*; fn gcd(a: u64, b: u64) -> u64 { if b == 0 { return a; } gcd(b, a % b) } fn main() { let mut s: String = String::new(); std::io::stdin().read_to_string(&mut s).ok(); let mut itr = s.trim().split_whitespace(); let a: u64 = itr.next().unwrap().parse().unwrap(); let b: u64 = itr.next().unwrap().parse().unwrap(); let g = gcd(a, b); let h = ((g as f64).sqrt() + 0.5) as u64; if g == h { println!("Odd"); } else { println!("Even"); } }