$(document).ready(function() {
        // Driver Code
        let input = "1123".split("");
        let output = [];
        printCombinations(input, 0, output, 0);
    });

    function getAlpabet(num) {
        const legend = '0ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        return legend[num];
    }
    function printCombinations(input,index,output,outLength) {
        // no more digits left in input string
        if (input.length == index) {
            // print output string & return
            var y = output.join("").split(" ").filter(function (x) {
                return x <= 26
            })

            if (y.length != input.length) {
                if (y.join("")) {
                    var label = ''
                    var ou = output.join("").split(" ").map(function (x) {
                        if (Number(x) > 0) {
                            label += getAlpabet(Number(x))
                        }
                        return Number(x) > 0 ? getAlpabet(Number(x)) +' = '+ Number(x) + ', ' : ""
                    }).join("")

                    console.log(label +'// '+ ou)
                }
            }

            return;
        }

        // place current digit in input string
        output[outLength] = input[index];

        // separate next digit with a space
        output[outLength + 1] = ' ';


        printCombinations(input, index + 1, output, outLength + 2);

        // if next digit exists make a
        // call without including space
        if(input.length != index + 1) {
            printCombinations(input, index + 1, output, outLength + 1);
        }

    }