#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int x[N],y[N],z[N];
char a[10000],b[10000];
int main(){
	cin>>a>>b;
	int len1=strlen(a);
	int len2=strlen(b);
	int flag=0;
	if(len1<len2){
		flag=1;
	}
	if(len1==len2&&strcmp(a,b)<0){
		flag=1;
	}
	if(flag){
		swap(len1,len2);
		swap(a,b);
		cout<<"-";
	}
	for(int i=0;i<len1;i++){
		x[i]=a[len1-i-1]-'0';
	}
	for(int i=0;i<len2;i++){
		y[i]=b[len2-i-1]-'0';
	}
	for(int i=0;i<len1;i++){
		z[i]+=x[i]-y[i];
		if(z[i] < 0){	
			z[i] += 10;
			z[i+1]-=1;
		}
	}
	while(z[len1] == 0 && len1 > 0){
		len1--;
	}
		
	for(int i=len1;i>=0;i--){
		cout<<z[i];
	}
	return 0;
}