A = input()
B = input()
C = []
D = []
for i in A:
    if i not in B:
        print("NO")
        break
else:
    a = list(A)
    b = list(B)
    for i in range(len(A)):
        for j in range(len(B)):
            if a[i] == b[j]:
                a[i]=0
                b[j]=0
    if a != b:
            print("NO")
    else:
        print("YES")