Scanf.scanf "%s %s" (fun a b ->
    let make_his s =
        let n = String.length s in
        let h = Array.make 26 0 in
        for i = 0 to n - 1 do
            let c = int_of_char s.[i] - 97 in
            h.(c) <- h.(c) + 1
        done;
        h
    in
    print_endline @@
        if make_his a = make_his b then "YES" else "NO"
)