#include<iostream>
#include<string.h>
using namespace std;
char s1[100];
char s2[100];
char s[100];
int main()
{
	int i,n,j,l1,l2,max,min,t,sum;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		t=0;
		memset(s,0,sizeof(s));
		scanf("%s",s1);
		scanf("%s",s2);
		l1=strlen(s1);
		l2=strlen(s2);
		max=l1>l2?l1:l2;
		min=l1<l2?l1:l2;
		for(j=0;j<min;j++)
		{
			sum=0;
			sum+=s1[j]+s2[j]-'0'-'0'+t;
			s[j]=sum%10+'0';
			t=sum/10;
		}
		for(;j<max;j++)
		{
			sum=0;
			sum+=s1[j]+s2[j]-'0'+t;
			s[j]=sum%10+'0';
			t=sum/10;
		}
		if(t>=1)
		s[max]=t+'0';
		for(j=0;j<=max;j++)
			if(s[j]!='0')
			{
			    printf("%c",s[j]);
				break;
			}
		++j;
		for(;s[j]!=NULL;j++)
			printf("%c",s[j]);
		printf("\n");
	}
	re