#include<iostream>
using namespace std;
void add(string a,string b)
{
		int arr[1001];
	int i=a.length()-1;
	int j=b.length()-1;
	int k=1000;
	while(j>=0){
		arr[k]=a[i--]+b[j--]-'0'-'0';
 
 
			while(arr[k]>9)
	{
		int e=arr[k];
		arr[k]=arr[k]%10;
	i>=0?	(a[i]=a[i]+e/10):(arr[--k]=e/10);
 
}
 
k--;
	}
	for(;i>=0;i--)
	{
		arr[k--]=a[i]-'0';
	}
	k++;
 
	int c[1001];int p=0;
	int f=0; 
	for(;k<=1000;k++)
	{
		c[p++]=(f*10+arr[k])/2;
		f=arr[k]%2;
	}
	int flag=1;
	for(int q=0;q<p;q++)
	{
		if(c[q]==0&&flag==1)
		continue;
		else{
 
		cout<<c[q];
		flag=0;
}
	}
	if(flag==1)
	cout<<"0";
	cout<<endl;
}
void sub(string a,string b)
{
		int arr[1001];
	int i=a.length()-1;
	int j=b.length()-1;
	int k=1000;
	while(j>=0){
		arr[k]=a[i--]- b[j--];
			if(arr[k]<0)
	{
		int e;
		e=10+a[i+1]-b[j+1];
 
		arr[k]=e;
		int h=i;
		if(a[h]=='0')
		{
 
		while(a[h]=='0')
		{
			a[h]='9';
			h--;
		}
		a[h]--;
	}
	else a[i]--;
	}
	k--;
	}
	for(;i>=0;i--)
	{
		arr[k--]=a[i]-'0';
	}
	k++;
	int c[1001];int p=0;
	int f=0; 
	for(;k<=1000;k++)
	{
		c[p++]=(f*10+arr[k])/2;
		f=arr[k]%2;
	}
	int flag=1;
	for(int q=0;q<p;q++)
	{
		if(c[q]==0&&flag==1)
		continue;
		else{
 
		cout<<c[q];
		flag=0;
}
	}
	if(flag==1)
	cout<<"0";
	cout<<endl;
}
main()
{
	int t=10;
	while(t--)
	{
 
	string a;
	string b;
	cin>>a;
	cin>>b;
     add(a,b);
     sub(a,b);
}
}

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