Python Program for specific requirements

Requirement:
Sample Input: s4b6c5a2d9

Output: ssssbbbbbbcccccaaddddddddd

string_data=input("Enter string: ")
result=''
for character in string_data:
	if character.isalpha():
		alphabet=character
	else:
		digit=int(character)
		result=result+alphabet*digit
print("You entered: ",string_data)
print("Final result: \n", result )

Requirement:
Sample Input:ssssbbbbbbcccccaaddddddddd

Output: 4s6b5c2a9d    

string_data=input("Enter string: ")
result=''
previous=string_data[0]
character_count=1
i=1
while i<len(string_data):
	if string_data[i]==previous:
		character_count=character_count+1
	else:
		result=result+str(character_count)+previous
		previous=string_data[i]
		character_count=1
	if i==len(string_data)-1:
		result=result+str(character_count)+previous
	i=i+1
print("You entered: ",string_data)
print("Final result: \n", result )