ADDREV.cpp

n = raw_input();
n= int(n);
for i in range(n):
   x,y = raw_input().split();
   x,y = x[::-1],y[::-1];
   z = str(int(x) + int(y));
   z = str(z);
   z = z[::-1];
   c = 0;
   while(z[c]=='0'):
   	  c = c+1;
   
   z= z[c:len(z)+1];
   print z;