// https://atcoder.jp/contests/ddcc2020-qual/tasks/ddcc2020_qual_e
//
#![allow(unused_imports)]
use std::io::*;
use std::io::Write;
use std::fmt::*;
use std::str::*;
use std::cmp::*;
use std::collections::*;

#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };

    ($iter:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, [ next / $t:tt ]) => {
        {
            let len = read_value!($iter, usize);
            (0..len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
        }
    };

    ($iter:expr, switch) => {
        {
            let ty = read_value!($iter, i32);
            if ty == 1 {
                vec![ty, read_value!($iter, i32), read_value!($iter, i32)]
            } else if ty == 2 {
                vec![ty, read_value!($iter, i32)]
            } else {
                vec![ty, read_value!($iter, i32)]
            }
        }
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! dvec {
    ($t:expr ; $len:expr) => {
        vec![$t; $len]
    };

    ($t:expr ; $len:expr, $($rest:expr),*) => {
        vec![dvec!($t; $($rest),*); $len]
    };
}

#[allow(unused_macros)]
macro_rules! ifv {
    ($t:expr, $a:expr, $b: expr) => {
        if $t { $a } else { $b }
    }
}

#[allow(unused_macros)]
macro_rules! fill {
    ($t:expr, $v:expr) => {
        for i in 0..$t.len() {
            $t[i] = $v;
        }
    };
}

#[allow(unused_macros)]
macro_rules! join {
    ($t:expr, $glue:expr) => {
        $t.into_iter().map(|w| w.to_string()).collect::<Vec<_>>().join($glue)
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        println!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}

fn range(l: usize, r: usize) -> Vec<usize> {
    let mut w = vec![];
    for i in l..r {
        w.push(i);
    }
    w
}

fn query_range(f: usize, n: usize) -> usize {
    query(range(f, f+n))
}

fn query(mut a: Vec<usize>) -> usize {
    let n = a.len();
    for i in 0..n {
        a[i] += 1;
    }
    println!("? {}", join!(a, " "));

    let mut s = String::new();
    std::io::stdin().read_line(&mut s).unwrap();
    match s.trim_right() {
        "Red" => 0,
        "Blue" => 1,
        "-1"   => panic!("something is wrong"),
        _      => panic!("parse error"),
    }
}

fn answer(a: Vec<usize>) {
    let a = a.into_iter().map(|v| ifv!(v == 0, 'R', 'B')).collect::<Vec<_>>();
    println!("! {}", join!(a, ""));
}

fn main() {
    let n: usize = {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        s.trim_right().parse().unwrap()
    };
    assert!(n % 2 == 1);

    let left_color = query_range(0, n);
    let right_color = query_range(n, n);
    assert!(left_color != right_color);

    let mut l = 0;
    let mut r = n;
    while l + 1 < r {
        let med = (l + r) / 2;
        if query_range(med, n) == left_color {
            l = med;
        } else {
            r = med;
        }
    }
    let mut result = vec![0; 2*n];
    result[l] = left_color;
    result[l+n] = right_color;
    for i in l+1..l+n {
        let mut c = range(l, i);
        c.append(&mut range(i+1, l+n+1));
        result[i] = query(c) ^ 1;
    }
    let mut bk = vec![];
    let mut want = vec![0, 0];
    for i in l..l+n+1 {
        if want[result[i]] < (n-1)/2 {
            want[result[i]] += 1;
            bk.push(i);
        }
    }
    for i in 0..2*n {
        if l <= i && i <= l+n {
        } else {
            bk.push(i);
            result[i] = query(bk.clone());
            bk.pop();
        }
    }
    answer(result);
}


Measured memory_bytes: 4816