import sys
arr = ['c=','c-', 'dz=', 'd-', 'lj', 'nj', 's=', 'z=']
def input():
a = sys.stdin.readline()
return a
def solve(str):
tcnt = 0
for i in range(8):
if str.find(arr[i]) > -1:
tcnt=tcnt+str.count(arr[i])
str=str.replace(arr[i],".")
#print(str, tcnt)
str=str.replace(".","")
#print(str)
tcnt=tcnt+len(str)
return tcnt
print(solve(input()))
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