Write a java program to calculate product of count of uppercase and lowercase letters

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import java.util.Scanner;
public class minmax {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the String");
        String s = sc.nextLine();
        int upper = 0;
        int lower = 0;
        int i;
        if (s.matches("[a-zA-Z]+")) {
            for (i = 0; i < s.length(); i++) {
                char c = s.charAt(i);
                if (c >= 'A' && c <= 'Z') {
                    upper++;
                }
                if (c >= 'a' && c <= 'z') {
                    lower++;
                }
            }
            System.out.println(upper * lower);
        }
        else
 
 
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Write a java program to calculate product of count of uppercase and lowercase letters

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