process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', (line) => {
  lines.push(line);
});
reader.on('close', () => {
  var a = lines[0]
  var characters = lines[1].split(" ").map(x => x.split(""))
  var new_ary = []
  for(var i = 0; i < a; i++) {
    new_ary.push(characters[0][i])
    new_ary.push(characters[1][i])
  }
  console.log(new_ary.join(""))
});