A = input()
B = input()
lA = list(A)
lB = list(B)
flg = 0

for i in range(len(lA)):
    
    if lA.count(lA[i]) != lB.count(lA[i]):
        flg = 1
        break

if flg == 1:
    print("NO")
else:
    print("YES")