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

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

ta = {}
tb = {}

for i = 1, a:len() do
	ta[i] = a:byte(i)
	tb[i] = b:byte(i)
end

table.sort(ta)
table.sort(tb)

ans = 'YES'

for i = 1, a:len() do
	if ta[i] ~= tb[i] then
		ans = 'NO'
		break
	end
end

print(ans)