#include<iostream>
#include<cstdio>
using namespace std;
int n;
bool dp[1002][1002];
char a[1002],b[1002];
int ans=1;
bool dfs(int x,int y)
{
	if(x==0&&y==0)return 1;
	if(dp[x][y]==0)dp[x][y]=1;
	else return 0;
	if(x-2>=0&&a[x-1]!=a[x]&&dfs(x-2,y))return 1;
	if(y-2>=0&&b[y]!=b[y-1]&&dfs(x,y-2))return 1;
	if(x-1>=0&&y-1>=0&&a[x]!=b[y]&&dfs(x-1,y-1))return 1;
	return 0;
} 
int main()
{
	freopen("card_.in","r",stdin);
	freopen("card_.out","w",stdout);
	scanf("%d",&n);
	scanf("%s%s",a+1,b+1);
	if(!dfs(n,n))printf("Impossible!");
	else printf("Accepted!");
	fclose(stdin);
	fclose(stdout);
	return 0;
}