/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main(String[] args) {
        System.out.println(validaPlaca("AAA3B11")); // true
        System.out.println(validaPlaca("DXQ9F92")); // true
        System.out.println(validaPlaca("ABC1233")); // false
        System.out.println(validaPlaca("1234")); // false
        System.out.println(validaPlaca("")); // false
    }
 
    public static boolean validaPlaca(String placa) {
        boolean result = false;
 
        Pattern pattern = Pattern.compile("[A-Z]{3}[0-9][A-Z][0-9]{2}");
        Matcher mat = pattern.matcher(placa);
        if (!mat.matches()) {
            result = false;
        } else {
            result = true;
 
        }
        return result;
 
    }
}

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