A  = input()
B = input()
a_list = []
b_list = []

for i in A:
    a_list.append(i)
   
for i in B:
    b_list.append(i)  

    
a = sorted(a_list)
b = sorted(b_list)

if a == b:
    print('YES')   
else:
    print('NO')