Given two binary strings s1 and s2. Print the resultant string after adding given two binary strings.
The first line of input contains an integer T denoting the number of test cases.
The first line of each test case contains two binary strings s1 and s2 separated by space.
For each test case print the resultant binary string.
1 <= T <= 70
1 <= |s1|, |s2| <= 200, where |s| represents the length of string s