base = input()
req = input()
alphas = [chr(i) for i in range(97, 97+26)]
dic = {i:0 for i in alphas}
dic2 = {i:0 for i in alphas}
ok = True
for m in base:
    dic[m] += 1
for m in req:
    dic2[m] += 1
for m in dic:
    if dic[m] != dic2[m]:
        ok = False
        break
if ok: print("YES")
else: print("NO")