use std::io::Write;

fn main() {
    let n = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<usize>().unwrap()
    };

    for i in 0..2 * n {
        if i % 2 == 0 {
            println!("D");
        } else {
            println!("R");
        }
        std::io::stdout().flush().unwrap();

        let v = {
            let mut line = String::new();
            std::io::stdin().read_line(&mut line).unwrap();
            line.trim().parse::<usize>().unwrap()
        };
        if v == 1 {
            break;
        }
    }
}