def solution(s):
answer = 0
index, same, different=0, 0, 0
for i in range(len(s)):
if s[index]==s[i]:
same+=1
else:
different+=1
if same==different:
answer+=1
index=i+1
same=0
different=0
if not(same==0 and different==0):
answer+=1
return answer