Merkkijono

import java.util.Scanner;
public class Main {
	public static void main (String [] args){
        	Scanner lukija = new Scanner(System.in);
                int apu = Integer.valueOf(lukija.nextLine());
		int apu2 = 1;
                String eka = "a";
		while(apu2<apu+1){
                            if(apu2 == 1){
                                       eka = "b" + eka + "b";
                            }
                            if(apu2 == 2){
                                       eka = "cbc" + eka + "cbc";
                            }
                            if(apu2 == 3){
                                       eka = "dcdbdcd" + eka + "dcdbdcd";
                            }
                            if(apu2 == 4){
                                       eka = "edecedebedecede" + eka + "edecedebedecede";
                            }
                            if(apu2 == 5){
                                       eka = "fefdfefcfefdfefbfefdfefcfefdfef" + eka + "fefdfefcfefdfefbfefdfefcfefdfef";
                            }
                            if(apu2 == 6){
                                       eka = "gfgegfgdgfgegfgcgfgegfgdgfgegfgbgfgegfgdgfgegfgcgfgegfgdgfgegfg" + eka + "gfgegfgdgfgegfgcgfgegfgdgfgegfgbgfgegfgdgfgegfgcgfgegfgdgfgegfg";
                            }
                            if(apu2 == 7){
                                       eka = "hghfhghehghfhghdhghfhghehghfhghchghfhghehghfhghdhghfhghehghfhghbhghfhghehghfhghdhghfhghehghfhghchghfhghehghfhghdhghfhghehghfhgh" + eka + "hghfhghehghfhghdhghfhghehghfhghchghfhghehghfhghdhghfhghehghfhghbhghfhghehghfhghdhghfhghehghfhghchghfhghehghfhghdhghfhghehghfhgh";
                            }         
                            apu2++;                  
		}
                System.out.println(eka);
	}
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: WRONG ANSWER