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

int main(){
    int n;
    int a,b,ans[10000];
    char *c,*d,*e;
    int i = 0;
    c = (char*)(malloc(20 * sizeof(char)));
    d = (char*)(malloc(20 * sizeof(char)));
    scanf("%d",&n);
    while(i < n){
            scanf("%d",&a);
            scanf("%d",&b);
            itoa(a,c,10);
            itoa(b,d,10);
            a = atoi(strrev(c)) + atoi(strrev(d));
            itoa(a,c,10);
            e = c;
            while(*e == '0')e++;
            ans[i] = atoi(strrev(e));
            i++;
            }
    i = 0;
    while(i < n){
            printf("%d\n",ans[i]);
            i++;
            }
}