MergingSquashing

//
let input = [11,'44', '69' ,'46','63','83', '13' ,'62','14','31', '68' ,'87'];

let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
//

// merging ab and cd = bc
// 42 and 17 = 21
// squashing 42 and 17 = 437 as 2 + 1 = 3   4 3 7

let n = +gets();

let merged = [];
let squashed = [];
let tempMerge = '';
let tempSquash = '';
let numSquash = 0;
let numToUse = '';
// merging
for(let i = 1; i <= n; i++) {

    let num = gets();
    //merging
    if (tempMerge.length < 1) {
        tempMerge += num[1];
    }

    else if (tempMerge.length == 1) {
        tempMerge += num[0];


        if (tempMerge.length == 2) { // 23 true
            merged.push(tempMerge); // push
            tempMerge = num[1];
        }
    }




    if(tempSquash.length < 1) {

        numSquash += Number(num[1]);
        tempSquash += num[0];

    }
    else if (tempSquash.length == 1) {

        numSquash += Number(num[0]);

        if(numSquash > 9) {
            numToUse = String(numSquash);
            tempSquash += numToUse[1] + num[1];


        }
        else {
            tempSquash += String(numSquash) + num[1];
        }

        numSquash = Number(num[1]); //


        if(tempSquash.length == 3) {
            squashed.push(tempSquash);

            tempSquash = num[0];
        }
    }

}
print(merged.join(" "));
print(squashed.join(" "));