let a = Scanf.scanf "%s %s %s" @@ fun a, b, c = [a; b; c]
let b = Scanf.scanf "%s %s %s" @@ fun a, b, c = [a; b; c]
let ans = if a[0] = b[2] && a[1] = b[1] && a[2] = b[0] then "YES" else "NO"
let () = print_endline ans