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.
a, s = input().lower(), int(input())
print(''.join(t.upper() if ord(t) < s + 97 else t.lower() for t in a))