UVA 10252 Java

import java.util.*;

public class main{
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
	while(sc.hasNextLine())
	{
		String str1 = sc.nextLine().toLowerCase();
		String str2 = sc.nextLine().toLowerCase();
		int[] count1 = new int[26];
		int[] count2 = new int[26];
		for(int i = 0; i < str1.length(); i++)
		{
			char c = str1.charAt(i);
			if(c>='a' && c <= 'z')
			count1[c - 'a']++;
		}
		for(int i = 0; i < str2.length(); i++)
		{
			char c = str2.charAt(i);
			if(c >= 'a' && c <= 'z')
			count2[c - 'a']++;
		}
		for(int i = 0; i < 26; i++)
			if(count1[i] != 0 && count2[i] != 0)
			{
				int min = Math.min(count1[i], count2[i]);
				for(int j = 0; j < min; j++)
					System.out.print((char)(i + 'a'));
				
			}
		System.out.println();
	}    
  }
};