function sumOf(input){
let firstNum=Number(input.shift());
let secondNum=Number(input.shift());
let line="";
for (let i=firstNum; i<=secondNum; i++){
let strNum=i+"";
let leftSum=Number(strNum.charAt(0))+ Number(strNum.charAt(1));
let rightSum=Number(strNum.charAt(3))+ Number(strNum.charAt(4));
if (leftSum