function randInt(minInclusive, maxEclusive) {
  return Math.floor(minInclusive + (maxEclusive - minInclusive) * Math.random());
}

function randomDirection(inputbuffer) {
  var initialDir = randInt(0, 4);
  var dir;
  for (dir = initialDir; dir < initialDir + 4; dir++) {
    // we can only go into a direction that has more than just a wall
    if (inputbuffer[dir % 4] != 'W') {
      break;
    }
  }
  return dir % 4;
}

function longestDirection(inputbuffer) {
  var dir = 0;
  var length = inputbuffer[0].length;
  for (var i = 1; i < 4; i++) {
    if (inputbuffer[i].length > length) {
      length = inputbuffer[i].length;
      dir = i;
    }
  }
  return dir;
}

function moveToEnd(input) {
  var move = '';
  for (var i = 0; i < input.length - 1; i++)
    move += 'F';
  switch (input.charAt(input.length - 1)) {
    case 'B':
      if (randInt(0, 2) == 0) {
        move += 'R';
      } else {
        move += 'L';
      }
      break;
    case 'L':
      move += 'L';
      break;
    case 'R':
      move += 'R';
      break;
  }
  return move;
}

function moveToLeft(input) {
  var move = '';
  for (var i = 0; i < input.length; i++) {
    switch (input.charAt(i)) {
      case 'B':
      case 'L':
        return move + 'L';
      default:
        if (i < input.length - 1) 
          move += 'F';
    }
  }
  return move;
}

function moveToRight(input) {
  var move = '';
  for (var i = 0; i < input.length; i++) {
    switch (input.charAt(i)) {
      case 'B':
      case 'R':
        return move + 'R';
      default:
        if (i < input.length - 1) 
          move += 'F';
    }
  }
  return move;
}

var steps = ['F', 'R', 'T', 'L'];

var inputbuffer = [];
var input = readline();
if (input == 'Quit') quit();
if (input != 'Start') inputbuffer.push(input);

for (var i = 0; i < 150; i++)
{
  // read 5 lines of input
  for (var j = inputbuffer.length; j < 5; j++) {
    input = readline();
    if (input == 'Quit') quit();
    inputbuffer.push(input);
  }
  // select a direction to walk into
  var dir;
  // randomly choose a method
  var method = randInt(0, 2);
  switch (method) {
    case 0: // method: random corridor
      dir = randomDirection(inputbuffer);
      break;
    case 1: // method: take longest corridor
      dir = longestDirection(inputbuffer);
      break;
  }

  var move = steps[dir];
  input = inputbuffer[dir];
  input = input.substring(0, input.length - 1); // chop off trailing 'W'

  // randomly choose a method
  var method = randInt(0, 3);
  switch (method) {
    case 0: // method: walk to end of hallway and turn left or right if possible
      move += moveToEnd(input);
      break;
    case 1: // method: walk until it is possible to turn LEFT or when you reach the end of the corridor
      move += moveToLeft(input);
      break;
    case 2: // method: walk until it is possible to turn RIGHT or when you reach the end of the corridor
      move += moveToRight(input);
      break;
  }

  print(move);

  inputbuffer = [];
}