use proconio::input;

fn main() {
    input!{
        n: f32,
        x: f32,
    };

    let l = x / n;
    let c = l.ceil() - 1.;

    let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    println!("{}", chars.chars().nth(c as usize).unwrap());
}