fn main() {
  let vec: Vec<i32> = reads(3);
  
  let abc = ["A","B","C"];
  let mut vec = vec.iter().zip(abc.iter()).collect::<Vec<_>>();
  vec.sort_by(|a,b|b.cmp(a));
  let ans = vec.iter().map(|&(_,c)|c).collect::<Vec<_>>();
  
  print_vec(&ans, "\n");
}

fn read<T: std::str::FromStr>() -> T {
  let mut buf = String::new();
  std::io::stdin().read_line(&mut buf).ok();
  buf.trim().parse::<T>().ok().unwrap()
}

fn reads<T: std::str::FromStr>(n: usize) -> Vec<T> {
  let mut vec: Vec<T> = vec![];
  for _ in 0 .. n {
    vec.push(read());
  }
  vec
}

fn print_vec<T: std::string::ToString>(vec: &Vec<T>, sep: &str) {
  let out = vec.iter().map(|e| e.to_string()).collect::<Vec<_>>().as_slice().join(sep);
  println!("{}", out);
}