B'You have a sequence a_1, a_2, ldots, a_n of length n , consisting of integers between 1 and m . You also have a string s , consisting of m characters B. You are going to perform the following n operations. Find the lexicographically smallest string you can get after these operations. A string x is lexicographically smaller than a string y of the same length if and only if in the first position where x and y differ, the string x has a letter that appears earlier in the alphabet than the corresponding letter in y . The first line contains the number of test cases t ( 1 <= t <= 2000 ). The first line of each test case contains two integers n and m ( 1 <= n, m <= 50 ) -- the length of the sequence a and the length of the string s respectively. The second line contains n integers a_1, a_2, ldots, a_n ( 1 <= a_i <= m ) -- the sequence a . For each test case, print a string of length m -- the lexicographically smallest string you can get. Each character of the string should be either capital English letter A or capital English letter B. In the first test case, the sequence a = [1, 1, 3, 1] . One of the possible solutions is the following. In the second test case, you are going to perform only one operation. You can replace either the 2 -nd character or 4 -th character of s with A. You can get strings BABBB and BBBAB after the operation. The string BABBB is the lexicographically smallest among these strings. In the third test case, the only string you can get is A. In the fourth test case, you can replace the 1 -st and 2 -nd characters of s with A to get AABB. In the fifth test case, you can replace the 1 -st and 3 -rd characters of s with A to get ABABBBB. '...