diff --git a/elisa_pl.py b/elisa_pl.py
index 4648e70..82cb250 100644
--- a/elisa_pl.py
+++ b/elisa_pl.py
@@ -1 +1,49 @@
-print("Hello, World!")
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+import re
+import random
+
+ARG_LITERAL = '%'
+GOODBYES =["Do zobaczenia", "Elo"]
+QUIT = "wyjscie"
+
+pairs = ( ('test (.*)', ('%1',)), ('test2 (.*)', ('%1 2',)) )
+
+
+def main():
+    is_running = True
+    while is_running:
+        user_input = input().lower()
+
+        if should_quit(user_input):
+            is_running = False
+            continue
+
+        for pair in pairs:
+            search = re.search(pair[0].lower(), user_input)
+
+            if not search:
+                continue
+
+            ans = pick_answer(pair)
+            print(substitute_arg(ans, search.groups()))
+
+    print(random.choice(GOODBYES))
+
+
+def should_quit(input):
+    return QUIT in input
+
+
+def substitute_arg(pattern, sub):
+    # TODO: More than one argument support
+    arg = ARG_LITERAL + '1'
+    return pattern.replace(arg, sub[0])
+
+
+def pick_answer(pair):
+    assert len(pair) == 2
+    idx = random.randint(0, len(pair[1]) - 1)
+    return pair[1][idx]
+
+
+if __name__ == "__main__":
+   main()
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