Decrypt

public class Decrypt  {
    public static void main(String[] args) {
        IO io = new IO();
        
        String letters = "abcdefghijklmnopqrstuvwxyz";
        
        String f = io.next();
        int k = io.nextInt();
        String S = io.next();
        
        if (k % 2 == 0) {
            System.out.println(S);
        } else {
            String decrypted = "";
            for (int i = 0; i < k; i++) {
                decrypted = "";
                for (int j = 0; j < S.length(); j++) {
                    char c = S.charAt(j);
                    for (int l = 0; l < letters.length(); l++) {
                        if (f.charAt(l) == c) {
                            decrypted += letters.charAt(l);
                            break;
                        }
                        
                    }
                }
                S = decrypted;
            }
            System.out.println(decrypted);
            
        }
        
        
    }
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: TIME LIMIT EXCEEDED

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: TIME LIMIT EXCEEDED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: TIME LIMIT EXCEEDED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: WRONG ANSWER

Test 19

Verdict: TIME LIMIT EXCEEDED

Test 20

Verdict: WRONG ANSWER

Test 21

Verdict: WRONG ANSWER

Test 22

Verdict: WRONG ANSWER

Test 23

Verdict: WRONG ANSWER

Test 24

Verdict: ACCEPTED

Test 25

Verdict: WRONG ANSWER

Test 26

Verdict: WRONG ANSWER

Test 27

Verdict: WRONG ANSWER

Test 28

Verdict: ACCEPTED

Test 29

Verdict: WRONG ANSWER

Test 30

Verdict: ACCEPTED