package Yukicoder

/**
 * Created by hichikawa on 2015/11/02.
 */
fun main(args: Array<String>) {
    fun readLineLongArray() : List<Long> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        val ret = arrStr.map { it.toLong() }
        return ret
    }
    fun readLineLong() : Long {
        val str = readLine() as String
        return str.toLong()
    }
    val str1 = (readLine() as String).toCharArray().sorted()
    val str2 = (readLine() as String).toCharArray().sorted()
    for (i in 0..(str1.size-1)) {
        if (str1[i] != str2[i]) {
            println("NO")
            return
        }
    }
    println("YES")

}