Competitive/Collaborative Programming Class

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;


 /*
 *   Author: Son Pham
 *     Date: September 26, 2012
 *  Purpose: This program finds the key to encrypted words.
 *  Problem: 10896 - B: Known Plaintext Attack
 * Comments: The code is ugly and barely readable. I'll go back and
 *           improve it when I have the time.
 */

class Plaintext {
    
    public static void findKey(String[] e, String d){
        String keys = "";
        for(int j = 0; j < e.length; j++){     
            if (e[j].length() == d.length()){
                int key = 0;
                
                for(int k = 0; k < d.length(); k++){
                    int pkey = key;
                    int che = e[j].charAt(k) - (int)'a' + 1;
                    int chd = d.charAt(k) - (int)'a' + 1;
                    if(chd > che)
                        key = 26 - chd + che;
                    else
                        key = che - chd;
                    if((k > 0) && (pkey != key)){
                        key = -1;
                        break;
                    }
                }
                if(key > -1){
                    key = (int)'a'+key;
                    keys = keys+key+" ";
                }
            }            
        }
        String[] results = keys.split("\\s+");
        int[] skeys = new int[results.length];
        for(int l = 0; l < results.length; l++){
            skeys[l] = Integer.parseInt(results[l]);
        }
        Arrays.sort(skeys);
        for(int m = 0; m < skeys.length; m++){
            System.out.print((char)skeys[m]);
        }
        System.out.println();
    }
    
    public static void main(String[] args) {
        try{
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
            String line = reader.readLine();
            int n = Integer.parseInt(line);
            for(int i = n; n > 0; --n){
                line = reader.readLine();
                String[] en = line.split("\\s+");
                line = reader.readLine();
                String de = line;
                findKey(en,de);
            }
        }
        catch(Exception ex){}
    }
}

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