Answer:
int firstNumber, secondNumber, duplicates;
secondNumber = duplicates = 0;
firstNumber = stdin.nextInt();
while (stdin.hasNextInt() && firstNumber > -1 && secondNumber > -1)
{
secondNumber = stdin.nextInt();
if (firstNumber == secondNumber)
{
duplicates++;
}
firstNumber = secondNumber;
}
System.out.println(duplicates);
Explanation:
The code is in JAVA.