#include <bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

#define pii pair<int,int>
#define pll pair<ll,ll>

#define rep(i,num,n) for(int i=num;i<(int)(n);i++) //for_loop
#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define rrep(i,num,n) for(int i=num-1;i>=(int)(n);i--) //reverse_for>
#define in(x,a,b) (a<=x && x<b)//範囲
#define reo return 0
#define all(v) v.begin(),v.end()

#define INFI 1010000000
#define INFL 4000000000000000000
//#define ten(x) ((int)1e##x)
//#define tenll(x) ((ll)1e##x)
#define PI 3.14159265358979
//#define mint modint1000000007
#define mint modint998244353

bool chmin(ll &a,ll b){if(a>b){a=b;return true;}return false;}
bool chmax(ll &a,ll b){if(a<b){a=b;return true;}return false;}
bool chmin(int &a,int b){if(a>b){a=b;return true;}return false;}
bool chmax(int &a,int b){if(a<b){a=b;return true;}return false;}

int dx[]={0,0,1,-1};int dy[]={1,-1,0,0};
//int dx[]={1,1,1,0,0,-1,-1,-1},dy[]={1,0,-1,1,-1,1,0,-1};
//----------------------------
int  main(){
    string h,s;
    cin>>h>>s;
    int H=h[h.size()-1]-'0';
    int S=s[s.size()-1]-'0';
    if((H+S)%2==0)cout<<"Possible";
    else cout<<"Impossible";
}