const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
const nums=[]
let clearNums=[]
rl.on('line', function (line) {
nums.push(line);
if(nums.length-1===Number(nums[0])){
nums.shift();
clearNums=Array.from(new Set(nums));
clearNums.sort((a,b)=>{return a-b})
clearNums.forEach(f=>{
console.log(f)
})
}
});