ruby.rb

print "Give me a four letter word:"
fourword = gets.chomp

if fourword == nil
    print "You need to give me some input first."
elsif fourword.length == 4
    print "Well done. '#{fourword}' appears to be 4 characters long."
elsif fourword =! nil and fourword.length < 4
    print "#{fourword} has too few characters."
elsif fourword.length > 5
    print "#{fourword} has too many characters."
end