# Here your code !
str1 = gets.chomp
str2 = gets.chomp

table1 = {}
table2 = {}

str1.each_char do |c|
    table1[c] ||= 0
    table1[c] += 1
end

str2.each_char do |c|
    table2[c] ||= 0
    table2[c] += 1
end

puts (table1 == table2) ? "YES" : "NO"