a=input()
L = []
i = 0
while i < len(a):
l = []
l.append(a[i])
i+=1
while i <len(a) and ord('a') <= ord(a[i]) <= ord('z'):
l.append(a[i])
i+=1
L.append(l)
ans = 0
for i in L[:-1]:
if len(i)%4 != 0:
ans += 4 - len(i)%4
print(ans)