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whatalnk/keyence2019-a.rb

Created January 17, 2019 02:16
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Keyence 2019 A
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keyence2019-a.rb
# https://atcoder.jp/contests/keyence2019/submissions/4028835
a = gets.chomp.split(" ").map(&:to_i)
if a.include?(1) && a.include?(9) && a.include?(7) && a.include?(4)
puts "YES"
else
puts "NO"
end
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