#include "stdio.h"
#include "string.h"
#include "ctype.h"
int reverse(char x[]);
int itoa(int n, char s[]);
int atoi(char s[]);
int main()
{
	int n;
	char s1[1000],s2[1000];
	int k;
	scanf("%d",&n);
	while(n-- >0){
		scanf("%s%s",s1,s2);
		reverse(s1);
		reverse(s2);
		k=atoi(s1) + atoi(s2);
		itoa(k,s1);
		k=atoi(s1);
		printf("%d\n",k);
	}
	return 0;
}

int reverse(char x[])
{
	int i,j;
	char a;
	for(i=0,j=strlen(x)-1;i<j;j--,i++){
		a=x[i];
		x[i]=x[j];
		x[j]=a;
	}
	return 0;
}
int itoa(int n, char s[])
{
	int i;
	i = 0;
	do { /* generate digits in reverse order */
		s[i++] = n % 10 + '0'; /* get next digit */
	} while ((n /= 10) > 0); /* delete it */
	s[i] = '\0';
	return 0;
}

int atoi(char s[])
{
	int i, n, sign;
	for (i = 0; isspace(s[i]); i++) /* skip white space */
		;
	sign = (s[i] == ' ')? 1: 1;
	if (s[i] == '+' || s[i] == ' ')/* skip sign */
		i++;
	for (n = 0; isdigit(s[i]); i++)
		n = 10 * n + (s[i] -'0');
	return sign * n;
}