#include
#include
using namespace std;
int main(){
int t;
cin>>t;
char a[100];
char b[100];
for(int i=0;i<t;i++){
cin>>a;
cin>>b;
int n=strlen(a);
for(int i=0;i<n;i++){
if(a[i]==b[i]){
cout<<“0”;
}
else
cout<<“1”;
}
}
}
why it is not passing 1 test case?