fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


exception BadInput
fun findAns s t "<" =
    if s < t then "YES"
    else "NO"
  | findAns s t ">" = 
    if s > t then "YES"
    else "NO"
  | findAns s t "=" = 
    if s = t then "YES"
    else "NO"
  | findAns _ _ _ = 
    raise BadInput


val () =
    let
        val s = readInt ()
        val t = readInt ()
        val c = readStr ()
        val ans = findAns s t c
    in
        print (ans ^ "\n")
    end