DuplicateNumbers

//let input =['c','c','a','b','a','a','b','c'];
let input =['1','2','2','2','2','18','3','12'];
let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);

let resultArr =[];
for (let i = 0 ;i< input.length;i++) {
    let element =gets();
    if(resultArr.includes(element)){
        continue;
    }
   resultArr.push(element);

}
print(resultArr.toString());