a = input()
b = input()
x = []
y = []
count = [0] * (max(a) + 1)
for elem in a:
    count[elem] += 1
for i in range(len(count)):
    for j in range(count[i]):
        x += i, end = ' '
count = [0] * (max(b) + 1)
for elem in b:
    count[elem] += 1
for i in range(len(count)):
    for j in range(count[i]):
        y += i, end = ' '
if x == y:
    print('YES')
else:
    print('NO')