function Team(name) {
    this.name = name;
    this.letters = [];
}
Team.prototype.addLetter = function (letter) {
     this.letters.push.apply(this.letters.push, arguments).join('n');
};
Team.prototype.toString = function () {
    return "Name of team - " + this.name +  'n' +"ltters : " + this.letters;
};
var a = 's';
b='g';
v='d';
var team1 =  new Team('letters');
team1.addLetter(a,b,v);
console.log(team1.toString());