cesar.java

public static void main(String[] argv) {
        new CesarCipher().solve();
    }

    public void solve() {
        Scanner in = new Scanner(System.in);
        int t = Integer.valueOf(in.nextLine());
        String line = in.nextLine();
        StringBuilder sb = new StringBuilder();
        String keys = in.nextLine();
        int key = Integer.valueOf(keys);
        for (int x = 0; x < t; x++) {
            int code = line.charAt(x);
            int characterType = getCharacterType(code);
            char ch;

            if (characterType == 1) {
                if (code + key > 90) ch = (char) (code + key - 24);
                else ch = (char) (code + key);
            } else {
                if (code + key > 122) ch = (char) (code + key - 24);
                else ch = (char) (code + key);
            }
            sb.append(ch);

        }
        System.out.println(sb.toString());
    }

    private static int getCharacterType(int code) {
        if (code >= 65 && code <= 90) return 1;
        else if (code >= 97 && code <= 122) return 2;
        else return 0;
    }