use std::process::exit;

use proconio::input_interactive;

fn main() {
    input_interactive! { n: usize }

    for i in 0..2 * n {
        let command = if i % 2 == 0 { 'D' } else { 'R' };
        println!("{command}");

        input_interactive! { v: i8 }
        match v {
            -1 | 1 => exit(0),
            _ => (),
        }
    }
}