Fleas

var players = [];
    var allowedJumps = Number(input[0]);
    var fieldSize = Number(input[1]);
    var winnerFound = false;
    var winner = '';

    input.forEach(function (x) {
        if (isNaN(x)) {
            var player = {};
            var tokens = x.split(', ');
            player['name'] = tokens[0];
            player['jump'] = Number(tokens[1]);
            player['position'] = 0;

            players.push(player);
        }
    });

    while (allowedJumps > 0) {
        players.forEach(function (player) {
            if (!winnerFound) {
                player['position'] += player['jump'];

                if (player['position'] >= fieldSize - 1) {
                    winner = player['name'];
                    winnerFound = true;
                }
            }
        });

        allowedJumps--;
    }

    if (!winnerFound) {
        var further = -1;
        players.forEach(function (x) {
            if (x['position'] >= further) {
                further = x['position'];
                winner = x['name'];
            }
        });
    }

    var field = '';
    var audiance = new Array(fieldSize + 1).join('#') + '\n' + new Array(fieldSize + 1).join('#') + '\n';
    players.forEach(function(player) {
        field += getLines(player) + '\n';
    });

    function getLines(player) {
        var line = new Array(fieldSize + 1).join('.');
        if(player['position'] >= fieldSize) {
            line = new Array(fieldSize).join('.') + player['name'][0].toUpperCase();
        } else {
            line = line.substr(0, player['position']) + player['name'][0].toUpperCase() + line.substr(player['position'] + 1);
        }

        return line;
    }

    var output = audiance + field + audiance + 'Winner: ' + winner;
    console.log(output);