7 added 6 characters in body
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Ruby, 100100 97 bytes

a=[*$<]a=$<.map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*?+}

Ruby, 100 bytes

a=[*$<].map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*?+}

Ruby, 100 97 bytes

a=$<.map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*?+}
6 deleted 1 character in body
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Ruby, 101100 bytes

a=[*$<].map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*"+"e*?+}

Ruby, 101 bytes

a=[*$<].map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*"+"}

Ruby, 100 bytes

a=[*$<].map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*?+}
5 deleted 6 characters in body
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Ruby, 111101 bytes

a=[*$<].map{|e|e. &:chomp.chars}
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*"+"}

Ruby, 111 bytes

a=[*$<].map{|e|e.chomp.chars}
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*"+"}

Ruby, 101 bytes

a=[*$<].map &:chomp
puts a.map(&:size).max.times.map{|i|a.map{|e|e[i]}.compact}.max_by{|e|eval e*"+"}
    Post Undeleted by cia_rana
4 added 34 characters in body
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    Post Deleted by cia_rana
3 added 13 characters in body
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2 deleted 2 characters in body
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