example1 = "radar"
example2 = "tacocat"
example3 = "madamimadam"

example4 = "anna"

def isPalindrome(phrase):
    if len(phrase)<=1:
        return True
    
    first = phrase[0]
    last = phrase[-1]
    
    if first==last:
        return isPalindrome( phrase[1:-1])
    else:
        return False