Update quit message and input prompt in script

dynamic_programming/catalan_numbers.py

@@ -59,21 +59,21 @@
 
 if __name__ == "__main__":
     print("\n********* Catalan Numbers Using Dynamic Programming ************\n")
-    print("\n*** Enter -1 at any time to quit ***")
+    print("\n*** Enter negative int at any time to quit ***")
     print("\nEnter the upper limit (≥ 0) for the Catalan number sequence: ", end="")
     try:
         while True:
-            N = int(input().strip())
+            N = int(input("Enter (int).strip())
             if N < 0:
                 print("\n********* Goodbye!! ************")
                 break
             else:
                 print(f"The Catalan numbers from 0 through {N} are:")
                 print(catalan_numbers(N))
                 print("Try another upper limit for the sequence: ", end="")
     except NameError, ValueError:
         print("\n********* Invalid input, goodbye! ************\n")
 
     import doctest
 
     doctest.testmod()