Repeating Numbers

let input = [
    '4',
    '1',
    '3',
    '3',
    '7'


]

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

let n = +gets();

let newArr = [];
let bigNums = [];
let result = 0;

for (let i = 1; i <= n; i++) {
    let numb = gets().split('').join(Number);
    newArr.push(numb);

}

let set = new Set(newArr);

let duplicate = newArr.filter(item => {
    if (newArr.length === 1) {
        result = newArr;
    }

    else if (set.has(item)) {
        set.delete(item);
    }
    else {
        return item;
    }
});


if (duplicate.length >= 2) {

    if (duplicate[0] > duplicate[1]) {
        duplicate = (duplicate[1]);
        result = duplicate;
    }
    else if (duplicate[0] < duplicate[1]) {
        duplicate = duplicate[0];
        result = duplicate;
    }

}
else if (duplicate.length > 0) {
    duplicate = (duplicate[0]);
    result = duplicate;
}


if (+result >= 2)
    console.log(+result);
else if (+result === 1) {
    console.log(+result);
}