import strutils

proc nextString: string =
    result = ""
    while not endOfFile stdin:
        let c = readChar stdin
        if c == ' ' or c == "\n"[0]: return
        elif c != '\r': add result, c

proc nextInt: int =
    parseInt nextString()


let
    a, b = nextInt()


if a < b:
    echo "YES"
    echo 0
else:
    echo "NO"
    echo a - b + 1