p, q = map(int, input().split())

S = ""
if 3 * p <= q:
    print("Impossible")
    exit()
elif 2 * p == q:
    print("Impossible")
    exit()
elif 2 * p <= q:
    x = 40000
    S += "U" * 2
    S += "R" * 2 * x
    S += "D" * 3
    S += "R" * x
    S += "U" * 2
    S += "R" * x
    S += "D" * 3
    S += "R" * 2 * x
    S += "U" * 2
else:
    x = 120000
    S += "U"
    S += "R" * x
    S += "D" * 2
    S += "R" * x
    S += "U"

x, y = 0, 0
XY = [(x, y)]
for s in S:
    if s == "U":
        y += 1
    elif s == "D":
        y -= 1
    elif s == "R":
        x += 1
    elif s == "L":
        x -= 1
    XY.append((x, y))


print("Possible")
print(len(XY) - 1)
for x, y in XY:
    print(x, y)