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.
s, x = input().lower(), int(input())
print(''.join(ch.upper() if ord(ch) < x + 97 else ch.lower() for ch in s))