#include <stdio.h>
long int rev(long int num)
{
	long int r,rev=0;
	if(num==0)
	return 0;
	while(num>0)
	{
		r = num%10;
		rev = rev*10+r;
		num = num/10;

	}
	return rev;
}
int main(void) {
	int test ;
	scanf("%d",&test);
	while(test--)
	{
		long int a,b,rev_a,rev_b;
		scanf("%ld%ld",&a,&b);
		rev_a = rev(a);
		rev_b = rev(b);
		long int sum = rev(rev_a+rev_b);
		printf("%ld\n",sum);
	}
	return 0;
}