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diff --git a/challenge-197/luca-ferrari/raku/ch-2.p6 b/challenge-197/luca-ferrari/raku/ch-2.p6
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+++ b/challenge-197/luca-ferrari/raku/ch-2.p6
@@ -0,0 +1,38 @@
+#!raku
+
+# Perl Weekly Challenge 197
+
+sub MAIN( *@list where { @list.grep( * ~~ Int ).elems == @list.elems } ) {
+    my @sorted = @list;
+    my $done = False;
+
+    #  list[0] < list[1] > list[2] < list[3]….
+    while ( ! $done ) {
+	$done = True;
+	for 0 ..^ @sorted.elems - 1 -> $i {
+	    if ( $i %% 2 ) {
+		if ( @sorted[ $i ] >= @sorted[ $i + 1 ] ) {
+		    # need to change
+		    my $temp = @sorted[ $i ];
+		    @sorted[ $i ] = @sorted[ $i + 1 ];
+		    @sorted[ $i + 1 ] = $temp;
+		    $done = False;
+		}
+	    }
+	    else {
+		if ( @sorted[ $i ] <= @sorted[ $i + 1 ] ) {
+		    # need to change
+		    my $temp = @sorted[ $i ];
+		    @sorted[ $i ] = @sorted[ $i + 1 ];
+		    @sorted[ $i + 1 ] = $temp;
+		    $done = False;
+
+		}
+	    }
+
+	}
+    }
+
+    @list.join( ',' ).say;
+    @sorted.join(',').say;
+}