Update app.py

Author: josemoracard

exercises/043-inheritance_and_polymorphism/app.py

@@ -7,12 +7,11 @@ def __init__(self, name, age, grade):
         self.grade = grade
 
     def introduce(self):
-        print(f"Hello! I am {self.name}, I am {self.age} years old, and my current grade is {self.grade}.")
+        return f"Hello! I am {self.name}, I am {self.age} years old, and my current grade is {self.grade}."
 
     def study(self, hours):
-        print(f"{self.name} is studying for {hours} hours.")
+        return f"{self.name} is studying for {hours} hours."
 
 ### DON'T modify the code above ###
 
 ### ↓ Your code here ↓ ###
-