'use strict'
const Main = (arg) => {
  let input = arg.trim().split('\n');
  let N = parseInt(input[0]);
  let stA = input[1].split(' ')[0];
  let stB = input[1].split(' ')[1];

  let newStr = '';
  for (let i = 0; i < N; i++){
    newStr = newStr + stA[i] + stB[i];
  }
  console.log(newStr);

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