function main(input){
    input = input.split('\n');
    num = parseInt(input[0]);
    str = input[1].split(' ');
    strA = str[0];
    strB = str[1];
    out='';
    for(i=0;i<num;i++){
        out = out + strA[i] + strB[i];
    }
    console.log(out);
}

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