n = int(input())
l = [*map(int, input().split())]
l2 = [[l[i], i] for i in range(n)]
l2.sort(key=lambda t: t[0])
u, d = map(int, input().split())
ans = [0] * n
for i, idx in l2:
if i == 1 and u > 0:
ans[idx] = 'U'
u -= 1
elif i == 2 and d > 0:
ans[idx] = 'D'
d -= 1
elif i == 3 and (u > 0 or d > 0):
if u > 0:
ans[idx] = 'U'
u -= 1
else:
ans[idx] = 'D'
d -= 1
if u > 0 or d > 0:
print("NO")
else:
print("YES")
print("".join(ans))