Letter Frequency in Word

import java.util.*;
public class LetterFrequencyW
{
    public static void main(String args[])
    {
        String str="";
        char ch=' ';
        int l=0,uF=0,lF=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a word: ");
        str=sc.next();
        str=str.trim();
        l=str.length();
        System.out.println("Letter\tFrequency");
        for(char i='A';i<='Z';i++)
        {
            for(int j=0;j<l;j++)
            {
                ch=str.charAt(j);
                if(ch==i)
                {
                    uF++;
                }
                if(ch==(i+32))
                {
                    lF++;
                }
            }
            if(uF>0)
            {
                System.out.println(i+"\t"+uF);
            }
            if(lF>0)
            {
                System.out.println((char)(i+32)+"\t"+lF);
            }
            uF=0;
            lF=0;
        }
    }
}