local ffi = require 'ffi'
local C, ct = ffi.C, ffi.typeof 'uint8_t[1]'
ffi.cdef 'int scanf(const char *, ...);'

print((function (c)
	local a,i,t,r={226,128,166},1,0,0
	while C.scanf("%c",c)==1 do
		if c[0]==a[i] then
			if i==3 then i,t=1,t+1 else i=i+1 end
		else
			i,t,r=1,0,t>r and t or r
		end
	end
	return r
end)(ct()))