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+#!python
+
+#
+# Perl Weekly Challenge 253
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-253>
+#
+
+import sys
+import collections
+
+# task implementation
+# the return value will be printed
+def task_2( args ):
+    ones = {}
+    for row_index in range( 0, len( args ) ):
+        sum = 0
+        for x in args[ row_index ]:
+            sum += x
+
+        if not sum in ones:
+            ones[ str( sum ) ] = []
+
+        ones[ str( sum ) ].append( row_index )
+
+    keys = list( ones.keys() )
+    keys.sort()
+    result = ""
+    for k in keys:
+        ones[ k ].sort()
+        for v in ones[ k ]:
+            result += str( v ) + ','
+
+
+    return result
+
+            
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    matrix = [
+        [1, 1, 0, 0, 0],
+        [1, 1, 1, 1, 0],
+        [1, 0, 0, 0, 0],
+        [1, 1, 0, 0, 0],
+        [1, 1, 1, 1, 1]
+        ]
+    print( task_2( matrix ) )