function main(arg) {
	arg = arg.trim().split(/\n/);
  	var words = arg[1].split(' '),
  		s = words[0], t = words[1],
        num = arg[0], out = '';
	for (var i = 0; i < num; i++){
    	out += s[i]+t[i]
    }
  	console.log(out);
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));