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import java.util.Scanner;
public class program6
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		System.out.print("Enter a String: ");
		String sen = sc.nextLine();
		sen = sen.toUpperCase();
		int count = 0;
		for (int i = 1; i < sen.length(); i++)
		{
			if (sen.charAt(i) == sen.charAt(i - 1))
			{
				count++;
			}
		}
		System.out.println(count);
	}
}