a = io.read()
b = io.read()
a = {a:byte(1,a.len(a))}
b = {b:byte(1,b.len(b))}
table.sort(a)
table.sort(b)
result = "YES"
for i, v in ipairs(a) do
  if v ~= b[i] then
    result = "NO"
    break
  end
end
print(result)