# -*- coding: utf-8 -*-
__author__ = 'yuuki'

S1 = raw_input()
S2 = raw_input()

N1 = [ord(i) for i in list(S1)]
N1.sort()

N2 = [ord(i) for i in list(S2)]
N2.sort()

for i in xrange(len(N1)):
    if N1[i] != N2[i]:
        print 'NO'
        exit()

print 'YES'