"use strict"
function main(arg) {
    var text = arg.trim().split("\n")[1].split(" ")
    var result = ""
    for (var i = 0; i < text[0].length; i++) {
        result += text[0][i] + text[1][i]
    }
    console.log(result)
}

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