h, s = input().split()

if h[0] == '-':
    hh = -1 * int(h[-1])
else:
    hh = int(h[-1])
if s[0] == '-':
    ss = -1 * int(s[-1])
else:
    ss = int(s[-1])
if (hh + ss) % 2 == 0:
    print("Possible")
else:
    print("Impossible")