(SPOJ) 2284 - Palavras primas - Solução

import java.io.*;
import java.util.*;

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    void processa() throws NumberFormatException, IOException {
        String line = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
             
        int[] vetor = new int[60];
       
        vetor['a'-'A'] = 1;
        vetor['b'-'A'] = 2;
        vetor['c'-'A'] = 3;
        vetor['d'-'A'] = 4;
        vetor['e'-'A'] = 5;
        vetor['f'-'A'] = 6;
        vetor['g'-'A'] = 7;
        vetor['h'-'A'] = 8;
        vetor['i'-'A'] = 9;
        vetor['j'-'A'] = 10;
        vetor['k'-'A'] = 11;
        vetor['l'-'A'] = 12;
        vetor['m'-'A'] = 13;
        vetor['n'-'A'] = 14;
        vetor['o'-'A'] = 15;
        vetor['p'-'A'] = 16;
        vetor['q'-'A'] = 17;
        vetor['r'-'A'] = 18;
        vetor['s'-'A'] = 19;
        vetor['t'-'A'] = 20;
        vetor['u'-'A'] = 21;
        vetor['v'-'A'] = 22;
        vetor['w'-'A'] = 23;
        vetor['x'-'A'] = 24;
        vetor['y'-'A'] = 25;
        vetor['z'-'A'] = 26;
        vetor['A'-'A'] = 27;
        vetor['B'-'A'] = 28;
        vetor['C'-'A'] = 29;
        vetor['D'-'A'] = 30;
        vetor['E'-'A'] = 31;
        vetor['F'-'A'] = 32;
        vetor['G'-'A'] = 33;
        vetor['H'-'A'] = 34;
        vetor['I'-'A'] = 35;
        vetor['J'-'A'] = 36;
        vetor['K'-'A'] = 37;
        vetor['L'-'A'] = 38;
        vetor['M'-'A'] = 39;
        vetor['N'-'A'] = 40;
        vetor['O'-'A'] = 41;
        vetor['P'-'A'] = 42;
        vetor['Q'-'A'] = 43;
        vetor['R'-'A'] = 44;
        vetor['S'-'A'] = 45;
        vetor['T'-'A'] = 46;
        vetor['U'-'A'] = 47;
        vetor['V'-'A'] = 48;
        vetor['W'-'A'] = 49;
        vetor['X'-'A'] = 50;
        vetor['Y'-'A'] = 51;
        vetor['Z'-'A'] = 52;
             
        while((line = br.readLine()) != null) {
            int soma = 0;
            for (int i = 0; i < line.length(); i++) {
                soma += vetor[line.charAt(i)-'A'];
            }

            boolean primo = true;
            for (int i = 2; i*i <= soma; i++) {
                if (soma%i == 0) {
                    primo = false;
                    break;
                }
            }
           
            if (primo) {
                bw.write("It is a prime word.\n");
            }
            else {
                bw.write("It is not a prime word.\n");
            }
        }

        bw.flush();
        bw.close();                   
        return;
    }
}