SA = input()
SB = input()
l = len(SA)
f = [False] * l

A = [""] * l
B = [""] * l

for i in range(l):
    A[i] = SA[i]
    B[i] = SB[i]

for i in range(l):
    for j in range(l):
        if A[i] == B[j]:
            f[i] = True
            B[j] = ""
            break
i = 0
while i < l and f[i]:
    i += 1

if i == l:
    print("YES")
else:
    print("NO")