def solve():
  x=input()
  y=input()
  cx=0
  while cx*len(x)<len(y):
    cx+=1
  cy=0
  while cy*len(y)<len(x):
    cy+=1
  xx=x*(cx+1)
  yy=y*(cy+1)
  if xx<yy:
    print('Y')
  elif xx>yy:
    print('X')
  else:
    if x<y:
      print('Y')
    else:
      print('X')
  

for _ in range(int(input())):
  solve()