UVA - 10252 - Common Permutation

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="";
        while((m=br.readLine())!=null) {
            int[] arr=new int[26];
            int[] arr2=new int[26];
            int[] result=new int[26];
            int max=-1;
            for(int j=0;j<m.length();j++){
                if(m.charAt(j)>='a' &&m.charAt(j)<='z' ){
                    arr[m.charAt(j)-97]++;
                }
            }
            m=br.readLine();
            for(int j=0;j<m.length();j++){
                if(m.charAt(j)>='a' &&m.charAt(j)<='z' ){
                    arr2[m.charAt(j)-97]++;
                }
               
            }
            for(int j=0;j<26;j++){
                result[j]=Math.min(arr2[j], arr[j]);
                for(int z=0;z<result[j];z++){
                    sb.append((char)(j+97));
                }
            }
            sb.append("\n");
        }
        System.out.print(sb);
    } 
}