I don't know what I'm doing wrong here. Please help.
def AddColon (data):
data.strip() # --> to remove the spaces
result = ''
for i in range (len(data)):
if str(data[i]).isalpha(): # to only include letters
result = result + data[i]
result.lower() # to make everything lowercase
result[0].upper() # to make the first letter uppercase
finalresult = result + ' : Hello'
return finalresult
input1 = input('Insert Data : ')
print(AddColon(str(input1)))