function barcodeGenerator(input) {

    let startNum = input[0]
    let endNum = input[1]

    let startA = startNum[0];
    let startB = startNum[1];
    let startC = startNum[2];
    let startD = startNum[3];

    let endA = endNum[0];
    let endB = endNum[1];
    let endC = endNum[2];
    let endD = endNum[3];

    let num1 = 0;
    let num2 = 0;
    let num3 = 0;
    let num4 = 0;

    for (let a = startA; a < endA; a++) {
        for (let b = startB; b < endB; b++) {
            for (let c = startC; c < endC; c++) {
                for (let d = startD; d < endD; d++) {

                    if (a % 2 !== 0 && a !== 0) {
                        num1 = a;
                    }
                    if (b % 2 !== 0 && b !== 0) {
                        num2 = b;
                    }
                    if (c % 2 !== 0 && c !== 0) {
                        num3 = c;
                    }
                    if (d % 2 !== 0 && d !== 0) {
                        num4 = d;
                    }

                    console.log("" + num1 + num2 + num3 + num4 + " ");
                }
            }
        }
    }
}
barcodeGenerator(["2345",
    "6789"])