merging and squashing

const input = [11, 44, 69, 46, 63, 83, 13, 62, 14, 31, 68, 87];
const gets = this.gets || ((input, index) => () => input[index++])(input, 0);
const print = this.print || console.log;


let n = +gets();
let arr = [];
for (let i = 1; i <= n; i++) {
    let num = +gets();
    arr.push(num)
}
let firstResult = [];
let secondResult = [];

for (let i = 0; i < arr.length - 1; i++) {
    let mergingFirstNumber = arr[i] % 10;
    let mergingSecondNumber = Math.floor(arr[i + 1] / 10)
    let squashingFirstNumber = Math.floor(arr[i] / 10);
    let squashingSecondNumber = Math.floor(arr[i + 1] % 10)
    let cdNum = mergingFirstNumber + mergingSecondNumber;
    if (cdNum >= 10) {
        cdNum = cdNum % 10;
    }
    firstResult.push(mergingFirstNumber + "" + mergingSecondNumber)
    secondResult.push(squashingFirstNumber + "" + cdNum + "" + squashingSecondNumber)
}

print(firstResult.join(' '));

print(secondResult.join(' '));