Imports System.Collections.Generic
Imports System.Console

Module Program
    Sub Main()
        Dim S As String = NextString()
        Dim ans As Integer = 0
        Dim pre As Char = " "c

        For Each c As Char In S
            If pre <> " "c And pre <> c Then ans += 1
            pre = c
        Next

        WriteLine(ans)
    End Sub

    Function NextString() As String
        Dim result As New List(Of Char)
        Do
            Dim tmp As Integer = Read()
            If tmp < 0 Then Exit Do
            Dim nextChar As Char = Chr(tmp)

            If Not Char.IsWhiteSpace(nextChar) Then
                result.Add(nextChar)
            ElseIf nextChar <> vbCr Then
                Exit Do
            End If
        Loop
        Return New String(result.ToArray())
    End Function
End Module
