open Printf open Scanf
module MyInt = struct let (+) = (+) let (-) = (-) let (/) = (/) let ( * ) = ( * ) let (mod) = (mod) let (%) = (mod) let (+=) r v = r := !r + v let (-=) r v = r := !r - v let ( *=) r v= r := !r * v let (/=) r v = r := !r / v let abs v = abs v let (land),(lor),(lxor),lnot,(lsl),(lsr),(asr) = (land),(lor),(lxor),lnot,(lsl),(lsr),(asr) let min_int,max_int = min_int,max_int end
module MyInt64 = struct
	let (+$) = (+) let (-$) = (-) let (/$) = (/) let ( *$) = ( * ) let (+) p q = Int64.add p q let (-) p q = Int64.sub p q let ( * ) p q = Int64.mul p q let (/) p q = Int64.div p q let (+=) r v = r := !r + v let (-=) r v = r := !r - v let ( *=) r v= r := !r * v let (/=) r v = r := !r / v let labs p = if p < 0L then -1L*p else p let (~|) p = Int64.to_int p let (~~|) p = Int64.of_int p let input_i64_array n = Array.init (~| n) (fun _ -> Scanf.scanf " %Ld" (fun v -> v)) let get_i64 _ = Scanf.scanf " %Ld" (fun v -> v) let get_2_i64 _ = Scanf.scanf " %Ld %Ld" (fun u v -> u,v) let get_3_i64 _ = Scanf.scanf " %Ld %Ld %Ld" (fun u v w -> u,v,w) let get_4_i64 _ = Scanf.scanf " %Ld %Ld %Ld %Ld" (fun u v w x -> u,v,w,x) let get_5_i64 _ = Scanf.scanf " %Ld %Ld %Ld %Ld %Ld" (fun u v w x y -> u,v,w,x,y) let print_i64_endline n = n |> Int64.to_string |> print_endline let (mod) m n = m - (m/n) * n let (%) = (mod) let rec gcd m n = match m,n with | m,0L -> m | m,n -> gcd n (m mod n) let lcm m n = (m*n) / gcd m n let rep from_ to_ fbod = let i,f = ref ~|from_,ref true in while !i <= ~|to_ && !f do match fbod ~~| !i with | `Break -> f := false | _ -> i := !i +$ 1; done let repb from_ to_ fbod = let i,f = ref ~|from_,ref true in while !i <= ~|to_ && !f do match fbod (~~| !i) with | `Break -> f := false | _ -> i := !i +$ 1 done; !f let repm from_ to_ m_init fbod = let i,f,m = ref ~|from_,ref true,ref m_init in while !i <= ~|to_ && !f do match fbod !m (~~| !i) with | `Break -> f := false | `Break_m m' -> (f := false; m := m') | `Ok m' -> (i := !i +$ 1; m := m') done; !m let repmb from_ to_ m_init fbod = let i,f,m = ref ~|from_,ref true,ref m_init in while !i <= ~|to_ && !f do match fbod (~~| !i) !m with | `Break -> f := false | `Break_m m' -> (f := false; m := m') | `Ok m' -> (i := !i +$ 1; m := m') done; (!m,!f) let string_of_list ?(separator=" ") f ls = let rec f0 a s = match a with | [] -> s | [h] -> s ^ (f h) ^ separator | h::t -> f0 t (s ^ (f h) ^ separator) in f0 ls "" let char_list_of_string str = let rec f0 i a = if i<0 then a else f0 (i-$1) (str.[i]::a) in f0 (String.length str -$ 1) [] let string_of_char_list ls = List.fold_left (fun u v -> u ^ (String.make 1 v)) "" ls
	let (@@@) = (@) let (@) a i = a.(~|i) let (<@) a (i,v) = a.(~|i) <- v
	let ceildiv m n = (m+n-1L) / n
	let abs v = Int64.abs v let (land),(lor),(lxor),lnot,(lsl),(lsr),(asr) = let open Int64 in (logand),(logor),(logxor),lognot,(fun u v -> shift_left u (~|v)),(fun u v -> shift_right u (~|v)),(fun u v -> shift_right_logical u (~|v)) let min_int,max_int = Int64.min_int,Int64.max_int let get_string _ = scanf " %s" (fun v -> v)
	let i32,i64 = Int64.to_int,Int64.of_int let alen a = i64 @@ Array.length a
	let dump_array a = a |> Array.to_list |> string_of_list Int64.to_string |> print_endline let i32_get_int _ = Scanf.scanf " %d" (fun v -> v) let i32_get_2_ints _ = Scanf.scanf " %d %d" (fun u v -> u,v) let i32_get_3_ints _ = Scanf.scanf " %d %d %d" (fun u v w -> u,v,w) let i32_get_4_ints _ = Scanf.scanf " %d %d %d %d" (fun u v w x -> u,v,w,x) let i32_get_5_ints _ = Scanf.scanf " %d %d %d %d %d" (fun u v w x y -> u,v,w,x,y) let repi from_ to_ fbod = let i,f = ref from_,ref true in while !i <= to_ && !f do match fbod !i with | `Break -> f := false | _ -> i := !i +$ 1 done
end open MyInt64

let c c = int_of_char c -$ int_of_char 'a'
module CSet = Set.Make (Char)
module CMap = Map.Make (Char)

let () =
	let a : char option array = Array.make 27 None in
	let b = Array.make 27 None in
	let s,t = scanf " %s %s" (fun u v -> u,v) in
	(* let css,cst = ref @@ CSet.empty, ref @@ CSet.empty in
	String.iter (fun c -> css := CSet.add c !css) s;
	String.iter (fun c -> cst := CSet.add c !cst) t; *)
	let cm = ref CMap.empty in
	(
		(* if CSet.elements !css <> CSet.elements !cst then "No" *)
		if String.length s <> String.length t then "No"
		else (
			let f = ref false in
			repi 0 (String.length s -$ 1) (fun i ->
				let idx,jdx = c s.[i],c t.[i] in
				(* printf "%c" (a.(idx) |> (function | None -> '-' | Some c -> c)); *)
				let r = match a.(idx),b.(jdx) with
				| None,None -> (
					a.(idx) <- Some t.[i];
					b.(jdx) <- Some s.[i]; `Ok
				)
				| Some c,None -> (
					if c = t.[i] then `Ok else (f:=true; `Break)
				)
				| None,Some c-> (
					if c = s.[i] then `Ok else (f:=true; `Break)
				)
				| Some c,Some d -> (
					if c = t.[i] && d = s.[i] then `Ok
					else (f:=true; `Break);
				)
				in r
			);
			if not !f then "Yes" else "No"
			(* let f = ref false
			for i=0 to String.length s -$1 do
				(* let idx = c s.[i] in *)
				match a.(c s.[i]) with
				| None -> (a.(c s.[i]) <- t.[i];`Ok)
				| Some _ -> `Break 
			done; *)
		)
	)
	|> print_endline









Measured memory_bytes: 5504