const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    while ((line = await readline())) {
        let count = parseInt(line);
        let allNum = [];
        for (let index = 0; index < count; index++) {
            allNum.push(parseInt(await readline()));
        }
        let result = [...new Set(allNum)];
        result = result.sort(sortNum);
        for (let index = 0; index < result.length; index++) {
            const element = result[index];
            console.log(element);
        }
    }
})();

function sortNum(a, b) {
    return a - b;
}