import sys input = sys.stdin.readline from collections import deque t = int(input()) for _ in range(t): n, m = map(int, input().split()) visited = [0] * 10001 q = deque([[n, '']]) while q: cur, s = q.popleft() if cur == m: print(s) break if visited[cur] == 0: q.append([cur * 2 % 10000, s + 'D']) q.append([cur - 1 if cur > 0 else 9999, s + 'S']) q.append([cur % 1000 * 10 +..