diff --git a/num_ways.py b/num_ways.py
new file mode 100644
index 0000000..6f76771
--- /dev/null
+++ b/num_ways.py
@@ -0,0 +1,11 @@
+print("How many stairs would you like to climb? ")
+x=input()
+
+def fibonacci_number(N):
+    if N<=1:
+        return N
+    return fibonacci_number(N-1) + fibonacci_number(N-2)
+ 
+    
+def num_ways(N):
+    return fibonacci_number(N+1)
diff --git a/replace.py b/replace.py
new file mode 100644
index 0000000..0701105
--- /dev/null
+++ b/replace.py
@@ -0,0 +1,14 @@
+def replace(listt, find, replace):
+    list2=list(listt)
+    for i, value  in enumerate(list2):
+        if listt[i] == find:
+            listt[i] = replace
+
+        elif type(value) in[list, tuple]:
+            list2[i]=replace(list2[i], find, replace)
+                                 
+        return list2
+
+exampleList = [ 'a', 1, [ ['a', 'b'], 1], ([1, 3, 'a'], 'b')]
+res = replace(exampleList, 'a', 'c')
+print(res)