using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
class Solve{
    int n;
    public Solve(){}
    StringBuilder sb;
    ReadData re;
    public static int Main(){
        new Solve().Run();
        return 0;
    }
    void Run(){
        sb = new StringBuilder();
        re = new ReadData();
        Calc();
    }
    void Calc(){
        int N = re.i();
        n = 2*N;
        int f = 0;
        int t = N;
        bool fb = AskFrom(0);
        bool tb = !fb;
        while(t-f>1){
            int m = (t+f)/2;
            bool mb = AskFrom(m);
            if(mb == fb){
                f = m;
            }
            else{
                t = m;
            }
        }
        bool[] ans = new bool[n];
        if(fb){
            ans[f] = true;
            ans[f+N] = false;
        }
        else{
            ans[f] = false;
            ans[f+N] = true;
        }
        for(int i=f+1;i<f+N;i++){
            Console.Write("? ");
            for(int j=0;j<f;j++){
                Console.Write(j+1);
                Console.Write(" ");
            }
            for(int j=f+N+1;j<n;j++){
                Console.Write(j+1);
                Console.Write(" ");
            }
            Console.WriteLine(i+1);
            string S = re.s();
            if(S[0] == 'R'){
                ans[i] = true;
            }
        }
        for(int i=0;i<f;i++){
            Console.Write("? ");
            for(int j=f+1;j<f+N;j++){
                Console.Write(j+1);
                Console.Write(" ");
            }
            Console.WriteLine(i+1);
            string S = re.s();
            if(S[0] == 'R'){
                ans[i] = true;
            }
        }
        for(int i=f+N+1;i<n;i++){
            Console.Write("? ");
            for(int j=f+1;j<f+N;j++){
                Console.Write(j+1);
                Console.Write(" ");
            }
            Console.WriteLine(i+1);
            string S = re.s();
            if(S[0] == 'R'){
                ans[i] = true;
            }
        }
        Console.Write("! ");
        for(int i=0;i<n;i++){
            if(ans[i]){
                Console.Write('R');
            }
            else{
                Console.Write('B');
            }
        }
        Console.WriteLine();
    }
    bool AskFrom(int v){
        Console.Write("? ");
        for(int i=v;i<v+n/2;i++){
            Console.Write((i%n)+1);
            if(i == v+n/2-1){
                Console.WriteLine();
            }
            else{
                Console.Write(" ");
            }
        }
        string S = re.s();
        if(S[0] == 'R'){
            return true;
        }
        else{
            return false;
        }
    }
}
class ReadData{
    string[] str;
    int counter;
    public ReadData(){
        counter = 0;
    }
    public string s(){
        if(counter == 0){
            str = Console.ReadLine().Split(' ');
            counter = str.Length;
        }
        counter--;
        return str[str.Length-counter-1];
    }
    public int i(){
        return int.Parse(s());
    }
    public long l(){
        return long.Parse(s());
    }
    public double d(){
        return double.Parse(s());
    }
    public int[] ia(int N){
        int[] ans = new int[N];
        for(int j=0;j<N;j++){
            ans[j] = i();
        }
        return ans;
    }
    public int[] ia(){
        str = Console.ReadLine().Split(' ');
        counter = 0;
        int[] ans = new int[str.Length];
        for(int j=0;j<str.Length;j++){
            ans[j] = int.Parse(str[j]);
        }
        return ans;
    }
    public long[] la(int N){
        long[] ans = new long[N];
        for(int j=0;j<N;j++){
            ans[j] = l();
        }
        return ans;
    }
    public long[] la(){
        str = Console.ReadLine().Split(' ');
        counter = 0;
        long[] ans = new long[str.Length];
        for(int j=0;j<str.Length;j++){
            ans[j] = long.Parse(str[j]);
        }
        return ans;
    }
    public double[] da(int N){
        double[] ans = new double[N];
        for(int j=0;j<N;j++){
            ans[j] = d();
        }
        return ans;
    }
    public double[] da(){
        str = Console.ReadLine().Split(' ');
        counter = 0;
        double[] ans = new double[str.Length];
        for(int j=0;j<str.Length;j++){
            ans[j] = double.Parse(str[j]);
        }
        return ans;
    }
    public List<int>[] g(int N,int[] f,int[] t){
        List<int>[] ans = new List<int>[N];
        for(int j=0;j<N;j++){
            ans[j] = new List<int>();
        }
        for(int j=0;j<f.Length;j++){
            ans[f[j]].Add(t[j]);
            ans[t[j]].Add(f[j]);
        }
        return ans;
    }
    public List<int>[] g(int N,int M){
        List<int>[] ans = new List<int>[N];
        for(int j=0;j<N;j++){
            ans[j] = new List<int>();
        }
        for(int j=0;j<M;j++){
            int f = i()-1;
            int t = i()-1;
            ans[f].Add(t);
            ans[t].Add(f);
        }
        return ans;
    }
    public List<int>[] g(){
        int N = i();
        int M = i();
        List<int>[] ans = new List<int>[N];
        for(int j=0;j<N;j++){
            ans[j] = new List<int>();
        }
        for(int j=0;j<M;j++){
            int f = i()-1;
            int t = i()-1;
            ans[f].Add(t);
            ans[t].Add(f);
        }
        return ans;
    }
}
public static class Define{
    public const long mod = 1000000007;
}
public static class Debug{
    public static void Print(double[,,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                for(int l=0;l<k.GetLength(2);l++){
                    Console.Write(k[i,j,l]+" ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
    public static void Print(double[,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                Console.Write(k[i,j]+" ");
            }
            Console.WriteLine();
        }
    }
    public static void Print(double[] k){
        for(int i=0;i<k.Length;i++){
            Console.WriteLine(k[i]);
        }
    }
    public static void Print(long[,,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                for(int l=0;l<k.GetLength(2);l++){
                    Console.Write(k[i,j,l]+" ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
    public static void Print(long[,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                Console.Write(k[i,j]+" ");
            }
            Console.WriteLine();
        }
    }
    public static void Print(long[] k){
        for(int i=0;i<k.Length;i++){
            Console.WriteLine(k[i]);
        }
    }
    public static void Print(int[,,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                for(int l=0;l<k.GetLength(2);l++){
                    Console.Write(k[i,j,l]+" ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
    public static void Print(int[,] k){
        for(int i=0;i<k.GetLength(0);i++){
            for(int j=0;j<k.GetLength(1);j++){
                Console.Write(k[i,j]+" ");
            }
            Console.WriteLine();
        }
    }
    public static void Print(int[] k){
        for(int i=0;i<k.Length;i++){
            Console.WriteLine(k[i]);
        }
    }
}


Measured memory_bytes: 13476