target_list = input()
eq_count = 0
neq_count = 0

for i in range(len(target_list)-1):
    if target_list[i] == target_list[i+1]:
          eq_count += 1
    else: 
          break
for i in range(len(target_list)-1):
    if target_list[i] != target_list[i+1]:
          neq_count += 1
          
print(eq_count+neq_count)