# No.69 文字を自由に並び替え
s = [input() for i in range(2)]
is_able = 'YES'

for i in s[0]:
    if i not in s[1]:
        is_able = 'NO'
        break
    if s[0].count(i) != s[1].count(i):
        is_able = 'NO'
        break

print(is_able)