题目的难度系数有问题，一些简单的题比较难的题难

let N, res = []
let len = parseInt(readline())
while( N = readline()){
    res.push(N)
}
let arr = [...new Set(res)]
let arr2 = arr.sort((a,b)=> a-b)
for(let item of arr2){
    print(item)
}