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#!/usr/bin/env ruby
class String
def distance(other)
sa = self.chars
oa = other.chars
d = 0
(0...self.length).each do |i|
d += 1 if sa[i] != oa[i]
end
return d
end
def difference(other)
sa = self.chars
oa = other.chars
(0...self.length).each do |i|
sa[i] = nil if sa[i] != oa[i]
end
return sa.join
end
end
input = $stdin.readlines.map(&:chomp)
(0...input.length).each do |i|
(i...input.length).each do |j|
if input[i].distance(input[j]) == 1
puts input[i].difference(input[j])
exit
end
end
end
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