var board = [
  {"0": 1},
  {"-1": 2, "0": 3, "1": 4},
  {"-2": 5, "-1": 6, "0": 7, "1": 8, "2": 9},
  {"-1": "A", "0": "B", "1": "C"},
  {"0": "D"}
];
var moves = {
  U: [-1, 0],
  D: [1, 0],
  L: [0, -1],
  R: [0, 1],
}
var pos = [2, -2];
var locations = [];
var fs = require("fs");
var input = fs.readFileSync("input.txt").toString().replace(/\r/g, "");
input.split("\n").slice(0, -1).forEach(function(line){
  if(line){
    line.split("").forEach(function(char){
      if(char){
        var move = moves[char];
        var newpos = pos.map((a, x)=>(a + move[x]));
        if(board[newpos[0]]){
          if(board[newpos[0]][newpos[1]]){
            pos = newpos;
          }
        }
      }
    });
  }
  console.log(board[pos[0]][pos[1]]);
  locations.push(board[pos[0]][pos[1]]);
});
console.log(locations.join(""));