#include <stdio.h>
#include <stdlib.h>
#include <string.h>

using namespace std;

int main(void){

	const int N = 1001;
	int count, i, j, k, max;
	char ch1[N];
	char ch2[N];
	int num3[N];
	int num4[N];
	scanf("%d", &count);

	for (i = 0; i < count; i++)
	{
		//初始化数组
		memset(ch1, 0, sizeof(ch1));   
		memset(ch2, 0, sizeof(ch2));
		memset(num3, 0, sizeof(num3));
		memset(num4, 0, sizeof(num4));

		scanf("%s", ch1);
		scanf("%s", ch2);

		//求输入的长度
		int len1 = strlen(ch1);
		int len2 = strlen(ch2);

		//倒置并存入新的整形数组
		k = 0;
		for (i = len1 - 1; i >= 0; i--)
			num3[k++] = ch1[i] - ‘0‘;
		k = 0;
		for (i = len2 - 1; i >= 0; i--)
			num4[k++] = ch2[i] - ‘0‘;

		max = len1 > len2 ? len1 : len2;

		//加法运算，>=10加1
		for (j = 0; j < max; j++){
			num3[j] += num4[j];
			if (num3[j] >= 10){
				num3[j] -= 10;
				num3[j + 1]++;
			}
		}
		
		//倒序输出
		if (num3[max])
			printf("%d", num3[max]);
		for (i = max - 1; i >= 0; i--)
			printf("%d", num3[i]);

		printf("\n");
	}

}