import sys # sys.setrecursionlimit(200005) int1 = lambda x: int(x)-1 pDB = lambda *x: print(*x, end="\n", file=sys.stderr) p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr) def II(): return int(sys.stdin.readline()) def LI(): return list(map(int, sys.stdin.readline().split())) def LLI(rows_number): return [LI() for _ in range(rows_number)] def LI1(): return list(map(int1, sys.stdin.readline().split())) def LLI1(rows_number): return [LI1() for _ in range(rows_number)] def SI(): return sys.stdin.readline().rstrip() # dij = [(0, 1), (-1, 0), (0, -1), (1, 0)] # dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)] inf = (1 << 63)-1 # inf = (1 << 31)-1 # md = 10**9+7 md = 998244353 n, m = LI() aa = LI1() for i in range(n-2): if aa[i] == aa[i+2]: print("No") exit() to = [[] for _ in range(m)] deg = [0]*m for i in range(n-1): u, v = aa[i], aa[i+1] if i & 1: to[v].append(u) deg[u] += 1 else: to[u].append(v) deg[v] += 1 # pDB(to) st = [u for u in range(m) if deg[u] == 0] uu = [] while st: u = st.pop() uu.append(u) for v in to[u]: deg[v] -= 1 if deg[v] == 0: st.append(v) if len(uu) == m: print("Yes") ans = [0]*m for i, u in enumerate(uu): ans[u] = i+1 print(*ans) # xx=[ans[a] for a in aa] # pDB(*xx) else: print("No")