#include<bits/stdc++.h>
using namespace std;
struct P{
	int m,n;
	P*next;
};
P*scanf(){
	char a,b,c,d,e;
	P*head=NULL;
	P*start=new P;
	if(cin.peek()=='-'){
		char f;
		cin>>f>>start->m>>a>>b>>start->n;
		start->m=-start->m;
	}
	else{
		cin>>start->m>>a>>b>>start->n;
	}
	start->next=head;
	head=start;
	P*tail=start;
	if(cin.peek()!='-1'){
		while(cin>>c){
			P*p=new P;
			cin>>p->m>>d>>e>>p->n;
			if(c=='-')p->m=-p->m;
			p->next=tail->next;
			tail->next=p;
			tail=p;
			if(cin.peek()=='-1')break;
		}
	}
	return head;
}
void printf(P*head){
	if(head==NULL)cout<<0<<endl;
	else{
		P*cur=head;
		cout<<cur->m<<"x^"<<cur->n;
		cur=cur->next;
		while(cur!=NULL){
			if(cur->m<0)cout<<cur->m<<"x^"<<cur->n;
			else cout<<"+"<<cur->m<<"x^"<<cur->n;
			cur=cur->next;
		}
		cout<<endl;
	}
}
P*add(P*head1,P*head2){
	P*head=NULL;
	P*p1=head1;
	P*p2=head2;
	P*tail=head;
	while(p1!=NULL||p2!=NULL){
		if(p1->n>p2->n){
			P*p=new P;
			p->n=p1->n;
			p->m=p1->m;
			if(tail==NULL){
				p->next=NULL;
				head=p;
				tail=p;
			}
			else{
				p->next=tail->next;
				tail->next=p;
				tail=p;
			}
			p1=p1->next;
		}
		if(p2->n>p1->n){
			P*p=new P;
			p->n=p2->n;
			p->m=p2->m;
			if(tail==NULL){
				p->next=NULL;
				head=p;
				tail=p;
			}
			else{
				p->next=tail->next;
				tail->next=p;
				tail=p;
			}
			p2=p2->next;
		}
		if(p1->n==p2->n){
			P*p=new P;
			p->n=p1->n;
			p->m=p1->m+p2->m;
			if(p->m!=0){
				if(tail==NULL){
					p->next=NULL;
					head=p;
					tail=p; 
				}
				else{
					p->next=tail->next;
					tail->next=p;
					tail=p;
				}
			} 
			p1=p1->next;
			p2=p2->next;
		}
		if(p1=NULL){
			while(p2!=NULL){
				P*p=new P;
				p->n=p2->n;
				p->m=p2->m;
				if(tail=NULL){
					p->next=NULL;
					head=p;
					tail=p;
				}
				else{
					p->next=tail->next;
					tail->next=p;
					tail=p;
				}
				p2=p2->next;
			}
		}
		if(p2==NULL){
			while(p1!=NULL){
				P*p=new P;
				p->n=p1->n;
				p->m=p1->m;
				if(tail==NULL){
					p->next=NULL;
					head=p;
					tail=p;
				}
				else{
					p->next=tail->next;
					tail->next=p;
					tail=p;
				}
				p1=p1->next;
			}
		}
	}
	return head;
}
int main(){
	P*head1=scanf();
	P*head2=scanf();
	printf(add(head1,head2));
	return 0;
}