function main(input) {
    const args = input.split(/\n/);
    const N = args[0],
          nums = args.slice(1, args.length - 1);

    console.log(nums.filter((n, i) => {
        return nums.indexOf(n) === i;
    }));
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));
