S = input()
count = len(S)

i = 0
for j in range(len(S)):
    if i < len(S)-2 and (S[i] == 'd' and S[i+1] == 'z' and S[i+2] == '='):
        count = count - 1
        i = i + 1
    if ((S[i] == 'c' and S[i+1] == '=') or
        (S[i] == 'c' and S[i+1] == '-') or
        (S[i] == 'd' and S[i+1] == '-') or
        (S[i] == 'l' and S[i+1] == 'j') or
        (S[i] == 'n' and S[i+1] == 'j') or
        (S[i] == 's' and S[i+1] == '=') or
        (S[i] == 'z' and S[i+1] == '=') ):
        count = count - 1
    if i >= len(S)-1:
        break
    i = i + 1
print(count)