input()
A=[int(c) for c in str(input()).split()]
S=sorted(int(c) for c in str(input()).split())
N,M = len(A),len(S)
R=[]
i,j=0,0
while i<N or j<M:
    if i==N:
        R+=S[j:]
        j=M
    else:
        while j<M and S[j]<A[j]:
            R.append(S[j])
            j+=1
        R.append(A[i])
        i+=1
for k in range(len(R)):
    print(k, end=" ")