arrsearch

const input = [
    '1,1,1,1,1,1,1,1'
];

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




let arrInput = gets().split(',').map(Number);

let notPresent = [];

let len = arrInput.length;

for (let i = 1; i < arrInput.length + 1; i++) {
    if (!arrInput.includes(i)) {
        notPresent.push(i);
    }
}

print(notPresent.join(','));