A = str(input())
B = str(input())

def str_to_pieces(X):
    X_box = []
    for i in range(len(X)):
        X_box.append(X[i:i+1])
    return X_box

A_list = str_to_pieces(A)
B_list = str_to_pieces(B)

A_dec = {}
B_dec = {}

for i in A_list:
    A_dec[i] = 0
for i in A_list:
    A_dec[i] += 1

for i in B_list:
    B_dec[i] = 0
for i in B_list:
    B_dec[i] += 1

if A_dec == B_dec:
    print("YES")
else:
    print("NO")