-- yukicoder My Practice
-- author: Leonardone @ NEETSDKASU

a = io.read()
b = io.read()

ta = {}
tb = {}

for i = 1, 26 do
	ta[i] = 0
	tb[i] = 0
end

for i = 1, a:len() do
	x = a:byte(i) - string.byte('a') + 1
	ta[x] = ta[x] + 1
	y = b:byte(i) - string.byte('a') + 1
	tb[y] = tb[y] + 1
end

for i = 1, 26 do
	if ta[i] ~= tb[i] then
		print('NO')
		os.exit()
	end
end

print('YES')