#include"iostream"
#include"string"
using namespace std;
int alen1,alen2;
string s1,s2;
int sum[50000],an[50000],am[50000]; 
bool compare();
void Jian(string s1,string s2)
{
    int i,s,f;    
	memset(an,0,sizeof(an));    
    memset(am,0,sizeof(am));
	memset(sum,0,sizeof(sum));    
    alen1=s1.size();   
    alen2=s2.size();
	f=0;    
	for(i=0;i<alen1;i++)    
        an[i]=s1[alen1-i-1]-'0';
    for(i=0;i<alen2;i++)    
        am[i]=s2[alen2-i-1]-'0';
	if(alen1>alen2||(alen1==alen2&&s1[0]>=s2[0]))
    {
        for(i=0;i<alen1;i++)    
            {
                sum[i]=an[i]-am[i];
                if(sum[i]<0)    
                {
                    sum[i]+=10;
                    an[i+1]--;
                }
            }
        }
    else
    {
        for(i=0;i<alen2;i++)    
            {
                sum[i]=am[i]-an[i];
                if(sum[i]<0)    
                {
                    sum[i]+=10;
                    am[i+1]--;
                }
            }
        f=1;
            
        }
    s=i;
    while(s>=0)
    {
		if(s==0){cout<<sum[0];break;}
		if(sum[s]){
			if(f)cout<<"-";
			cout<<sum[s];break;
			}
		s--;
	}
	for(i=s-1;i>=0;i--)cout<<sum[i];
	cout<<endl;   
}

  void Jia(string s1,string s2)
  {
		int i,j,t,t2,k;
		t=0;k=0;
		t2=s2.size()-1;
		for(i=s1.size()-1;i>=0;i--)
		{
			if(t2>=0)
			{
				sum[t++]=(s1[i]-'0'+s2[t2]-'0')+k;
				k=0;
				if(sum[t-1]>=10){
					k=1;
					sum[t-1]-=10;
				}
				t2--;
			}
			else {
				sum[t++]=(s1[i]-'0')+k;
				k=0;
				if(sum[t-1]>=10){
					k=1;
					sum[t-1]-=10;
				}
			}
			
		}
		for(j=t2;j>=0;j--)
		{
			sum[t++]=(s2[j]-'0')+k;
			k=0;
			if(sum[t-1]>=10){
					k=1;
					sum[t-1]-=10;
				}
			}
	   if(k)cout<<k;
	   for(i=t-1;i>=0;i--)cout<<sum[i];
	   cout<<endl;
	}	
	
int main()
{
	int t,f1,f2;
	cin>>t;
	while(t--)
	{
		memset(sum,0,sizeof(sum));
		f1=f2=1;
		cin>>s1>>s2;
		if(s1[0]=='+')s1.erase(0,1);
		if(s2[0]=='+')s2.erase(0,1);
		if(s1[0]=='-'){f1=-1;s1.erase(0,1);}
		if(s2[0]=='-'){f2=-1;s2.erase(0,1);}
		if(f1*f2==1)
		{
			if(f1==1)Jia(s1,s2);
			else {
				cout<<"-";
				Jia(s1,s2);
			}
		}
		else {
			if(f1==-1)
			{
				Jian(s2,s1);
			}
			else Jian(s1,s2);
		}
	}		
	
	return 0;
}