import java.util.*;
class Duck_No
{
// Function to check whether
// the given number is duck number or not.
static boolean check_duck(String num)
{
// Ignore leading 0s
int i = 0, n = num.length();
while (i < n && num.charAt(i) == '0')
i++;
// Check remaining digits
while (i < n) {
if (num.charAt(i) == '0')
return true;
i++;
}
return false;
}
// Driver Method
public static void main(String args[])
{
String num = "1023";
if (check_duck(num))
System.out.println("It is a duck number");
else
System.out.println("It is not a duck number");
}
}