n=input()
cou=0
y=0
for i in range(len(n)):
if n[i]=='f':
cou+=1
if cou>1:
u=0
i=0
while u==0:
if n[i]=='f':
u=i
i+=1
b=u
while u==b:
if n[i]=='f':
u=i
i+=1
y=1
elif cou==0:
print(-2)
else:
print(-1)
if y==1:
print(int(i-1))
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