import std.stdio;
import std.string;
import std.conv;
import std.algorithm;
import std.array;

void main() {
    ubyte[] a = readln().strip.map!(to!ubyte).array;
    ubyte[] b = readln().strip.map!(to!ubyte).array;

    sort(a); sort(b);
    if (to!string(a) == to!string(b)) {
        writeln("YES");
        return;
    }
    writeln("NO");
}