christmasTree

function exercise(input) {

    let n = Number(input.shift());
    let result = "";

    for (var row = 1; row <= n; row++){
        for (var k = 1; k <= n - row  + 1; k++){
            result += " ";
        }
        for(var col = 1; col <= row; col++){
            result += " " + "*";
        }
        result += "\n";
    }
    console.log(result);

}

exercise(["5"]);