UVA - 11541 - Decoding

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        String m = "";
        int cases = Integer.parseInt(br.readLine());
        for (int i = 0; i < cases; i++) {
            m = br.readLine();
            char temp = ' ';
            boolean flag = true;
            StringBuilder num = new StringBuilder();
            int n;
            sb.append("Case ").append((i + 1)).append(": ");
            for (int j = 0; j < m.length(); j++) {
                if (m.charAt(j) >= 'A' && m.charAt(j) <= 'Z') {
                    if (j > 0) {
                        n = Integer.valueOf(num.toString());
                        num = new StringBuilder();
                        for (int z = 0; z < n; z++) {
                            sb.append(temp);
                        }
                    }
                    temp = m.charAt(j);
                    flag = false;
                } else {
                    num.append(m.charAt(j));
                }
            }
            n = Integer.valueOf(num.toString());
            for (int z = 0; z < n; z++) {
                sb.append(temp);
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
}