#include<bits/stdc++.h>
using namespace std;
string s1,s2;
int a[250],b[250],c[250],len,p;
char f='+';
int main(){
    cin>>s1>>s2;
    if(s1.size()<s2.size()||(s1.size()==s2.size()&&s1<s2)){
        f='-';
        swap(s1,s2);
    } 

  for(int i=0;i<s1.size();i++){
        a[s1.size()-i-1]=s1[i]-'0';
       
  }
 
 
    for(int i=0;i<s2.size();i++){
        b[s2.size()-i-1]=s2[i]-'0'; 
     
    }
    len=s1.size();
    for(int i=0;i<len;i++){
        if(a[i]<b[i]){
            a[i+1]=a[i+1]-1;
            a[i]=a[i]+10;
        } 
        c[i]=a[i]-b[i];
    }
    if(f=='-') cout<<'-';
     
    for(int i=len-1;i>=0;i--){
        if(c[i]!=0){
            p=i;
            break;
        }
         
    }
     
    for(int i=p;i>=0;i--){
        cout<<c[i];
    } 
         
    return 0;
}
/**************************************************************
	Problem: 1269
	User: wuhanyu
	Language: C
	Result: Compile Error
****************************************************************/