int n,m;int c[1000000 + 55];int nnum[1000000 + 55];int aa[1000000 + 55];int sum[1000000 + 55];int len;void init() {	memset(c,0,sizeof(c));	memset(aa,-1,sizeof(aa));}bool input() {	while(cin>>n>>m) {	for(int i=0;i>nnum[i];	return false;	}	return true;}int lowbit(int x) {	return x&(-x);}void add(int i,int val) {	while(i <= n) {	c[i] += val;	i += lowbit(i);	}}int get_sum(int i) {	int sum = 0;	while(i > 0) {	sum += c[i];	i -= lowbit(i);	}	return sum;}void binary_find(int pos,int id) {	int l = 1;	int r = n;	while(l <= r) {	int mid = (l + r)>>1;	int ret = get_sum(mid);	if(aa[mid] == -1) {	if(ret >= nnum[pos] - id) r = mid - 1;	else l = mid + 1;	}	else if(ret == nnum[pos] - id) {	add(mid,-1);	aa[mid] = -1;	len--;	break;	}	else if(ret > nnum[pos] - id) r = mid - 1;	else if(ret < nnum[pos] - id) l = mid + 1;	}}void cal() {	int q = n;	len = 0;	int cnt = 1;	while(q--) {	int type;	cin>>type;	if(type == -1) {	if(len == 0)continue;	if(nnum[0] > len)continue;	int now = lower_bound(nnum,nnum + m,len) - nnum;	for(int i=0;i<=now;i++)	binary_find(i,i);	}	else {	aa[cnt] = type;	add(cnt,1);	cnt++;	len++;	}	}	if(len <= 0){puts("Poor stack!");return ;}	for(int i=1;i<=n;i++)	if(aa[i] != -1)	printf("%d",aa[i]);	puts("");}void output() {}int main() {	while(true) {	init();	if(input())return 0;	cal();	output();	}	return 0;}