diff --git a/nums_to_funcs.py b/nums_to_funcs.py
new file mode 100644
index 0000000..89cb4f2
--- /dev/null
+++ b/nums_to_funcs.py
@@ -0,0 +1,21 @@
+import sys
+
+def num_to_func(n):
+    res = []
+    pattern = "0???1???2"
+    for ch in pattern[::-1]:
+        if ch != "?":
+            res.append(ch)
+            continue
+        res.append(n % 3)
+        n = n // 3
+    res = "".join((str(x) for x in res[::-1]))
+    return res[:3] + " " + res[3:6] + " " + res[6:]
+    
+if __name__ == "__main__":
+    with open(sys.argv[1]) as f_in:
+        for line in f_in:
+            line = line.strip()
+            if not line:
+                continue
+            print("{} -> {}".format(line, num_to_func(int(line))))