#include

#include <math.h> #include #include <stdio.h> #include #include #include #include <string.h> #include using namespace std; #define LL long long const int N = 1e5 + 10; const int INF = 0x3f3f3f3f;

int a[N],b[N];

int main(){ string x,y; cin>>x>>y; int len1=x.size(); int len2=y.size();

if((len2>len1)||((len2==len1)&&x<y)){
	swap(x,y);
	swap(len2,len1);
	cout<<"-";
}
for(int i=0;i<len1;i++)
	a[i]=x[len1-1-i]-'0';
for(int i=0;i<len2;i++)
	b[i]=y[len2-1-i]-'0';

int len=max(len1,len2);
for(int i=0;i<len;i++){
	a[i]-=b[i];
	if(a[i]<0)
	{
		a[i+1]--;
		a[i]+=10;
	}
}
while(a[len]==0&&len>0)
	len--;
	
for(int i=len;i>=0;i--)
	cout<<a[i];
return 0;

}**