Q N : 7 : Write a function that takes a string as parameter and returns a string with every successive repetitive character replaced by ?e.g. school may become scho?l.

Answer No : 7 :

s=input("Enter string")
lista=list(s)
l=len(s)
for x in range(l-1):
    if lista[x]==lista[x+1]:
        lista[x+1]="?"
print("".join(lista))

Output:
Enter stringschool
scho?l