X-Git-Url: http://nitlanguage.org

diff --git a/examples/rosettacode/ab.nit b/examples/rosettacode/ab.nit
index 9138c0c..ce18fc0 100644
--- a/examples/rosettacode/ab.nit
+++ b/examples/rosettacode/ab.nit
@@ -10,4 +10,8 @@
 module ab
 
 var words = gets.split(" ")
+if words.length != 2 then
+	print "Expected two numbers"
+	return
+end
 print words[0].to_i + words[1].to_i