def cora(st_k):
    li = ['c=', 'c-', 'dz=', 'd-', 'lj', 'nj', 's=', 'z=']
    sum=0
    for i in range(len(li)):
        tmp = st_k.find(li[i])
        if tmp != -1:
            sum+=st_k.count(li[i])
            st_k=st_k.replace(st_k[tmp:tmp+len(li[i])],' ')
            #print st_k, tmp
    return st_k , str(sum)
k=raw_input()
#print cora(k)
k= cora(k)
st=k[0].replace(' ','') #이부분 바꿈 ...
print len(st)+int(k[1])