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Changed to incorporate things from the other Ruby answer. 1 char smaller.
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nilamo
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Ruby

6463 chars.

puts (t=gets.split(//);puts t).map{|i|t.count(i)==1>1?i:nil:i}.compact.join 

Ruby

64 chars.

t=gets.split(//);puts t.map{|i|t.count(i)==1?i:nil}.compact.join 

Ruby

63 chars.

puts (t=gets.split(//)).map{|i|t.count(i)>1?nil:i}.compact.join 
added 1 characters in body
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Svish
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Ruby

Ruby 64 64 chars.

t=gets.split(//);puts t.map{|i|t.count(i)==1?i:nil}.compact.join 

Ruby 64 chars.

t=gets.split(//);puts t.map{|i|t.count(i)==1?i:nil}.compact.join 

Ruby

64 chars.

t=gets.split(//);puts t.map{|i|t.count(i)==1?i:nil}.compact.join 
Post Made Community Wiki
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nilamo
  • 1.9k
  • 13
  • 22

Ruby 64 chars.

t=gets.split(//);puts t.map{|i|t.count(i)==1?i:nil}.compact.join