a = input()
b = input()
x = []
y = []
count1 = [0] * (max(a) + 1)
for elem in a:
    count1[elem] += 1
count2 = [0] * (max(b) + 1)
for elem in b:
    count2[elem] += 1
if count1 == count2:
    print('YES')
else:
    print('NO')