```java
Scanner scan = new Scanner(System.in);
boolean isValid;
do {
isValid = true;
System.out.println("Enter String: ");
String s = scan.nextLine();
char[] chars = s.toCharArray();
int sumASCII = 0;
if (s.length() < 5 || s.length() > 7)
isValid = false;
if (!s.equals(s.toUpperCase()))
isValid = false;
char[] used = new char[s.length()];
int usedCount = 0;
for (char c : chars) {
for (char u : used) {
if (c == u)
isValid = false;
}
used[usedCount] = c;
usedCount++;
sumASCII = sumASCII + (int) c;
}
if (sumASCII < 420 || sumASCII > 600)
isValid = false;
if (!isValid) System.out.println("Invalid");
} while (!isValid);
System.out.println("Valid");
```