#include<bits/stdc++.h>
usingnamespacestd;
inta[10001],b[10001],c[10001],pd=0;
intmain(){
string s1,s2;
cin>>s1>>s2;
if((s1<s2&&s1.size()==s2.size())||s1.size()<s2.size()){
swap(s1,s2);
pd=1;
}
for(inti=0;i<s1.size();i++){
a[s1.size()-i]=s1[i]-'0';
}
for(inti=0;i<s2.size();i++){
b[s2.size()-i]=s2[i]-'0';
}
intlen=max(s1.size(),s2.size());
for(inti=1;i<=len;i++){
if(a[i]<b[i]){
a[i+1]--;
a[i]+=10;
}
c[i]=a[i]-b[i];
}
while(c[len]==0&&len>=1){
len--;
}
if(pd==1){
cout<<"-";
}
for(inti=len;i>=1;i--){
cout<<c[i];
}
if(len<1){
cout<<"0"<<endl;
}
}