s=input()
t="yukicoder"
ans=0
now,cnt=0,0
now=s.find(t,now)
if now==-1:
  exit(print(0))
  
while s.find(t,now)!=-1:
  x=s.find(t,now)
  
  if x==now:
    cnt+=1
  else:
    cnt=1
    
  now=x+9
  ans=max(ans,cnt)

print(ans)