import std.stdio;
import std.string, std.conv, std.array, std.algorithm;
import std.uni, std.math;

void main(){
    auto A = readln.chomp;
    auto B = readln.chomp;
    int[26] cntA, cntB;

    foreach(a ; A){
        cntA[a - 'a']++;
    }

    foreach(b ; B){
        cntB[b - 'a']++;
    }

    string ans = cntA == cntB ? "YES" : "NO";

    ans.writeln;
}