first = input()
numStr = first.split()
numStr[0] = int(numStr[0])
numStr[1] = int(numStr[1])

if numStr[0] + 1 - numStr[1] > 0 :
    print("NO")
    print(abs(numStr[0] + 1 - numStr[1]))
else :
    print("YES")
    print(abs(numStr[0] + 1 - numStr[1]))