Adata = input();
Bdata = input();

AdataH = sorted(Adata);
BdataH = sorted(Bdata);

hsize= len(AdataH);
counter = 0;

for inter in range(0,hsize):
    if AdataH[inter] == BdataH[inter]:
        counter = counter + 1;

if counter == hsize:
    print("YES");
else:
    print("NO");