<filename>3. Strings/mutation.py
'''
Title     : Mutations
Subdomain : Strings
Domain    : Python
Author    : <NAME>
Created   : 29 September 2016
'''
__author__ = '<NAME>'
 
s = raw_input().strip()

i, c = raw_input().split()

print (s[:int(i)]+c+s[int(i)+1:])
<filename>3. Strings/mutation.py
'''
Title     : Mutations
Subdomain : Strings
Domain    : Python
Author    : <NAME>
Created   : 29 September 2016
'''
__author__ = '<NAME>'
 
s = raw_input().strip()

i, c = raw_input().split()

print (s[:int(i)]+c+s[int(i)+1:])
Title     : Mutations
 Subdomain : Strings
 Domain    : Python
 Author    : <NAME>
 Created   : 29 September 2016