function Main(input) {
    var N = parseInt(input[0], 10);
    var S = input[1].split('');
    var T = input[2].split('');
    var result = '';

    for(var i = 0; i < N; i++) {
        result += S[i];
        result += T[i];
    }

    console.log(result);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split(/\n|\s/));