T=int(input())
for _ in range(T):
  N,M=map(int, input().split())
  A=list(map(int, input().split()))
  B=list(map(int, input().split()))
  D={}
  for a in A:
    D[a]=1
  for b in B:
    if b in D:
      D[b]=2
    else:
      D[b]=-1
  r,b,c=0,0,0
  R,B,C=[],[],[]
  for d in D:
    if D[d]==2:
      c+=1
      C.append(d)
    elif D[d]==1:
      r+=1
      R.append(d)
    else:
      b+=1 
      B.append(d)
  ans=[]
  if c==0:
    if r==0 or b==0:
      print('Yes')
      if r==0:
        for i in B:
          print('Blue',i)
      else:
        for i in R:
          print('Red',i)
    else:
      print('No')
  elif c%2==0:
    if b==0:
      print('Yes')
      for i in R:
        print('Red',i)
      for i in range(c//2):
        x,y=C[2*i],C[2*i+1]
        print('Red',x)
        print('Blue',x)
        print('Blue',y)
        print('Red',y)
    elif r==0:
      print('Yes')
      for i in B:
        print('Blue',i)
      for i in range(c//2):
        x,y=C[2*i],C[2*i+1]
        print('Blue',x)
        print('Red',x)
        print('Red',y)
        print('Blue',y)
    else:
      print('Yes')
  else:
    print('Yes')
    for i in R:
      print('Red',i)
    for i in range(c):
      if i%2==0:
        print('Red',C[i])
        print('Blue',C[i])
      else:
        print('Blue',C[i])
        print('Red',C[i])
    for i in B:
      print('Blue',i)