#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

struct UnionFind {
    vector<int> data;
    UnionFind(int size) : data(size, -1) {}
    bool unionSet(int x, int y) {
        x = root(x); y = root(y);
        if (x != y) {
        if (data[y] < data[x]) swap(x, y);
        data[x] += data[y]; data[y] = x;
        }
        return x != y;
    }
    bool findSet(int x, int y) {
        return root(x) == root(y);
    }
    int root(int x) {
        return data[x] < 0 ? x : data[x] = root(data[x]);
    }
    int size(int x) {
        return -data[root(x)];
    }
};

template<typename T>
class Compress{
    public:
    vector<T> data;
    int offset;
    Compress(vector<T> data_, int offset=0): offset(offset){
        data = data_;
        sort(begin(data), end(data));
        data.erase(unique(begin(data), end(data)), end(data));
    };
    int operator[](T x) {
        auto p = lower_bound(data.begin(), data.end(), x);
        assert(x == *p);
        return offset+(p-data.begin());
	}
    T inv(int x){
        return data[x-offset];
    }
    int size(){
        return data.size();
    }
};

void solve(){
    int n, m; cin >> n >> m;
    vector<int> a(n), b(m);
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0; i < m; i++) cin >> b[i];
    if(n == 0){
        cout << "Yes" << endl;
        for(int x: b) cout << "Red " << x << '\n';
        return;   
    }
    if(m == 0){
        cout << "Yes" << endl;
        for(int x: a) cout << "Blue " << x << '\n';
        return;
    }
    set<int> st_a;
    for(int x: a) st_a.insert(x);
    set<int> st_ab;
    for(int x: b){
        if(st_a.count(x)) st_ab.insert(x);
    }
    if(st_ab.size() == 0){
        cout << "No" << endl;
        return;
    }
    vector<int> only_a, only_b;
    for(int x: a){
        if(st_ab.count(x) == 0) only_a.push_back(x);
    }
    for(int x: b){
        if(st_ab.count(x) == 0) only_b.push_back(x);
    }
    bool red = true;
    cout << "Yes" << endl;
    for(int x: only_a) cout << "RED " << x << '\n';
    bool first = true;
    for(int x: st_ab){
        if(red){
            cout << "RED " << x << '\n';
            cout << "BLUE " << x << '\n';
        }else{
            cout << "BLUE " << x << '\n';
            cout << "RED " << x << '\n';
        }
        if(first){
            for(int x: only_b) cout << "BLUE " << x << '\n';
        }
        red = !red;
        first = false;
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int t; cin >> t;
    while(t--) solve();
}