open System

type Boy = int
type Girl = int
type Student = { Boy: Boy; Girl: Girl }

let (|Pair|Alone|) x = 
    if x.Boy <= x.Girl then Pair
    else Alone

let solve x = 
    let yasuo = x |> function | Pair -> "YES" | Alone -> "NO"
    let left = abs <| x.Boy - x.Girl
    (yasuo, left)

let A, B = let t = stdin.ReadLine().Split() |> Array.map int in t.[0], t.[1]

solve { Boy = A + 1; Girl = B }
|> fun res -> printfn "%s\n%i" (fst res) (snd res)