string = input()
# croa=[c=,c-,dz=,d-,lj,nj,s=,z=]
croa_three = 0
croa_dub = 0
count=0
for i in range(len(string)):
if string[i]=="c":
if string[i+1] == "-" or string[i+1] == "=":
croa_dub= croa_dub+1
else:
pass
elif string[i]=="d":
if string[i+1] == "z":
if string[i+2] == "=":
croa_three = croa_three + 1
croa_dub=croa_dub-1
else:
pass
elif string[i+1] == "-":
croa_dub= croa_dub+1
else:
pass
elif string[i]=="l":
if string[i+1] == "j":
croa_dub=croa_dub+1
else:
pass
elif string[i]=="n":
if string[i+1]=="j":
croa_dub=croa_dub+1
else:
pass
elif string[i] =="s" or string[i]=="z":
if string[i+1] == "=":
croa_dub=croa_dub+1
else:
pass
else:
pass
print(len(string)-(1*croa_dub)-(2*croa_three))
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