import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

n,m = map(str,input().split())

nn = int(n[-1])
mm = int(m[-1])
if nn % 2 == mm % 2:
    print("Possible")
else:
    print("Impossible")