The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.

The second line of the input is an integer between 0 and 26, inclusive.
t, p = input().lower(), ' abcdefghijklmnopqrstuvwxyz'[int(input())]
print(''.join(i.upper() if i < p else i for i in t))