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#!/usr/bin/env lua
local c = 0
for line in io.lines() do
local s1, e1, s2, e2 = line:match("(%d+)-(%d+),(%d+)-(%d+)")
s1, e1, s2, e2 = tonumber(s1), tonumber(e1), tonumber(s2), tonumber(e2)
if (s1 >= s2 and e1 <= e2) or (s2 >= s1 and e2 <= e1) then
c = c + 1
end
end
print(c)
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