'use strict'

function Main(input) {
    const lines = input.trim().split("\n");
    const N = parseInt(lines[0]);
    const [S, T] = lines[1].split(" ");

    let answer = "";
    for (var i = 0; i < N; i++) {
        answer += S[i] + T[i]
    }
    console.log(answer)
}

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